题目内容（请给出正确答案）

[主观题]

An unstable upright equilibrium position on a vessel means that the mrtacenter is（）

A．lower than the center of gravity

B．at the same height as the center of gravity

C．heigher than the baseline

D．on the longitudinal centerline

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更多“An unstable upright equilibriu…”相关的问题

第1题

An unstable upright equilibrium position on a vessel means that the metacenter is ______.

A.lower than the center of gravity

B.at the same height as the center of gravity

C.higher than the baseline

D.on the longitudinal centerline

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第2题

An unstable upright equilibrium position on a vessel means that the metacenter is ______.A

An unstable upright equilibrium position on a vessel means that the metacenter is ______.

A.lower than the center of gravity

B.at the same height as the center of gravity

C.higher than the baseline

D.on the longitudinal centerline

点击查看答案

第3题

An unstable upright equilibrium position on a vessel means that the mrtacenter is（）.

A. lower than the center of gravity

B. at the same height as the center of gravity

C. heigher than the baseline

D. on the longitudinal centerline

点击查看答案

第4题

Our ape-men forefathers had no obvious natural weapons in the struggle for survival in the open. They had neither the powerful teeth nor the strong claws of the big cats. They could not【1】with the bear, whose strength, speed and claws【2】an impressive "smallfire" weaponry. They could not even defend themselves【3】running swiftly like the horses, zebras or small animals. If the ape-men had attempted to compete on those terms in the open, they would have been【4】to failure and extinction. But they were【5】with enormous concealed advantages of a kind not possessed by any of their competitors.

In the search【6】the pickings of the forest, the ape-men had【7】efficient stereoscopic vision and a sense of colour that the animals of the grasslands did not possess. The ability to see clearly at close range permitted the ape-men to study practical problems in a way that lay far【8】the reach of the original inhabitants of the grassland. Good longdistance sight was【9】another matter. Lack of long-distance vision had not been a problem for forest-dwelling apes and monkeys because the higher the viewpoint, the greater the range of sight so【10】they had had to do was climb a tree. Out in the open, however, this simple solution was not【11】Climbing a hill would have helped, but in many piaces the ground was flat. The ape-men【12】the only possible solution. They reared up as high as possible on their hind limbs and began to walk upright.

This vital change of physical position brought about considerable disadvantages. It was extremely unstable and it meant that the already slow ape-men became slower still.【13】they persevered and their bone structure gradually became【14】to the new, unstable position that【15】them the name Homo erectus, upright man.

A.match

B.compare

C.rival

D.equal

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第5题

Our ape-men forefathers had no obvious natural weapons in the struggle for survival in the open. They had neither the powerful teeth nor the strong【C1】______ of the big cats. They could not【C2】______ with the bear, whose strength, speed and claws【C3】______ an impressive "small-fire" weaponry. They could not even defend themselves【C4】______　running swiftly like the horses, zebras or small animals. If the ape-men had attempted to compete on those terms in the open, they would have been【C5】______ to failure and extinction. But they were【C6】______ with enormous concealed advantages of a kind not possessed by any of their competitors.

In the search 【C7】______ the pickings of the forest, the ape-men had【C8】______ efficient stereoscopic vision and a sense of colour that the animals of the grasslands did not possess. The ability to see clearly at close 【C9】______ permitted the ape-men to study practical problems in a way that lay far【C10】______ the reach of the original inhabitants of the grassland. Good long-distance sight was【C11】______ another matter. Lack of long-distance vision had not been a problem for'forest-dwelling apes and monkeys because the higher the viewpoint, the greater the range of sight- so【C12】______ they had to do was climb a tree. Out in the open, however, this simple solution was not【C13】______ Climbing a hill would have helped, but in many places the ground was flat. The ape-men【C14】______ the only possible solution. They reared up as high as possible on their【C15】______ limbs and began to walk upright.

This【C16】______　change of physical position brought about considerable【C17】______ .It was extremely unstable and it meant that the already slow ape-men became slower still.【C18】______　 ,they persevered and their bone structure gradually became【C19】______ to the new, unstable position that【C20】______ them the name Homo erectus, upright man.

【C1】

A.claws

B.paws

C.hoofs

D.hands

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第6题

Our ape-men forefathers had no obvious natural weapons in the struggle for survival in the open. They had neither the powerful teeth nor the strong claws of the big cats. They could not 【B1】______　　 with the bear, whose strength, speed and claws 【B2】______ an impressive 'smallfire' weaponry. They could not even defend themselves 【B3】______　running swiftly like the horses, zebras or small animals. If the ape-men had attempted to compete on those terms in the open, they would have been 【B4】______　to failure and extinction. But they were 【B5】______ with enormous concealed advantages of a kind not possessed by any of their competitors.

In the search 【B6】______ the pickings of the forest, the ape-men had 【B7】______　efficient stereoscopic vision and a sense of colour that the animals of the 'grasslands did not possess. The ability to see clearly at close range permitted the ape-men to study practical problems in a way that lay far 【B8】______ the reach of the original inhabitants of the grassland. Good long- distance sight was 【B9】______　another matter. Lack of long-distance vision had not been a problem for forest-dwelling apes and monkeys because the higher the viewpoint, the greater the range of sight so 【B10】______　they had had to do was climb a tree. Out in the open, however, this simple solution was not 【B11】______　. Climbing a hill would have helped, but in many places the ground was flat. The ape-men 【B12】______ the only possible solution. They reared up as high as possible on their hind limbs and began to walk upright.

This vital change of physical position brought about considerable disadvantages. It was extremely unstable and it meant that the already slow ape-men became slower still.【B13】______　, they persevered and their bone structure gradually became【B14】______ to the new, unstable position that【B15】______them the name Homo erectus, upright man.

【B1】

A.match

B.compare

C.rival

D.equal

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第7题

Our ape-men forefathers had no obvious natural weapons in the struggle for survival in the open. They had neither the powerful teeth nor the strong claws of the big cats. They could not 【B1】______　　 with the bear, whose strength, speed and claws 【B2】______ an impressive 'smallfire' weaponry. They could not even defend themselves 【B3】______　running swiftly like the horses, zebras or small animals. If the ape-men had attempted to compete on those terms in the open, they would have been 【B4】______　to failure and extinction. But they were 【B5】______ with enormous concealed advantages of a kind not possessed by any of their competitors.

【B1】

A.match

B.compare

C.rival

D.equal

点击查看答案

第8题

Our ape-men forefathers had no obvious natural weapons in the struggle for survival in the

open. They had neither the powerful teeth nor the strong claws of the big cats. They could not 【B1】______ with the bear, whose strength, speed and claws 【B2】______ an impressive 'smallfire' weaponry. They could not even defend themselves 【B3】______ running swiftly like the horses, zebras or small animals. If the ape-men had attempted to compete on those terms in the open, they would have been 【B4】______ to failure and extinction. But they were 【B5】______ with enormous concealed advantages of a kind not possessed by any of their competitors.

In the search 【B6】______ the pickings of the forest, the ape-men had 【B7】______ efficient stereoscopic vision and a sense of colour that the animals of the 'grasslands did not possess. The ability to see clearly at close range permitted the ape-men to study practical problems in a way that lay far 【B8】______ the reach of the original inhabitants of the grassland. Good long- distance sight was 【B9】______ another matter. Lack of long-distance vision had not been a problem for forest-dwelling apes and monkeys because the higher the viewpoint, the greater the range of sight so 【B10】______ they had had to do was climb a tree. Out in the open, however, this simple solution was not 【B11】______ . Climbing a hill would have helped, but in many places the ground was flat. The ape-men 【B12】______ the only possible solution. They reared up as high as possible on their hind limbs and began to walk upright.

This vital change of physical position brought about considerable disadvantages. It was extremely unstable and it meant that the already slow ape-men became slower still.【B13】______ , they persevered and their bone structure gradually became【B14】______ to the new, unstable position that【B15】______them the name Homo erectus, upright man.

【B1】

A．match

B．compare

C．rival

D．equal

点击查看答案