题目内容

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

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钢丝绳式施工升降机的电气系统中,采用热继电器,当电动机发热超过一定温度时,热继电器就及时分断主电路,电动机失电,停止转动。()

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