题目内容

吊钩是可以补焊的，当吊钩表面产生细微裂纹的时候，吊钩可以补焊，可以继续使用。()

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Kort nozzles are installed around the propellers of some vessels to ______.

A. increase the thrust of the propeller
B. protect the propeller from striking sawyers
C. protect the propeller from striking barges towed on the hip
D. protect the propeller from touching bottom in low water

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Knowing the compass heading that is 90°to the side of a ship will enable the operator of a

A. into the wind
B. away in fire and smoke
C. directly to the standby boat
D. directly to the nearest land

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Keeping certain cargoes separated because of their inherent characteristics is known as ____.

A. overstowage
B. segregation
C. spot loading
D. cargo typing

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齿轮和齿条的啮合间隙是通过调节齿条背面的背轮实现的。()

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