單項(xiàng)選擇題()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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1.單項(xiàng)選擇題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