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單項(xiàng)選擇題

The winch is liable（）worn-out in this way.

A.getting
B.to get
C.to have got
D.for getting

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單項(xiàng)選擇題

The winch at Hatch No.3 is（）trouble.

A.at
B.in
C.on
D.over

單項(xiàng)選擇題

The term PROLONGED BLAST refers to（）.

A.a blast of from five to seven seconds' duration
B.a blast of from five to six seconds' duration
C.a blast of from four to six seconds' duration
D.a blast of from six to seven seconds' duration

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