单项选择题

（）of my ship’s propeller is very strong.

A.The running reflection
B.The turning effect
C.The moving speed
D.The changing sensibility

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单项选择题

A crack in the deck plating of a vessel may be temporarily prevented from increasing in length by（）.

A.cutting a square notch at each end of the crack
B.drilling a hole at each end of the crack
C.slot-welding the crack
D.welding a doubler over the crack

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