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單項(xiàng)選擇題

The fishing boat upset and sank to the（）of the sea.

A.base
B.under part
C.bottom
D.down place

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單項(xiàng)選擇題

The major use of water in fighting fires is to（）.

A.suffocate the fire
B.absorb the oxygen supporting the fire
C.act as a cooling agent
D.wash the fire away

單項(xiàng)選擇題

The majority of cargo gear breakdowns are a result of（）.

A.guy failures
B.topping lift failures
C.bending of the boom from compression
D.gooseneck failure