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單項(xiàng)選擇題

The force exerted by a propeller which tends to throw the stern right or left is called（）.

A.slip
B.sidewise force
C.rotational force
D.thrust

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單項(xiàng)選擇題

The fog is lifted，so（）the radar．

A.close
B.open
C.switch off
D.switch on

單項(xiàng)選擇題

The external flotation bladder of an immersion suit should be inflated（）.

A.only after two hours in the water
B.only after four hours in the water
C.before entry into the water
D.upon entry into the water

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