你可能感興趣的試題

The pivot pin at the base of a sheath-screw boom davit must be（）.

A.inserted each time before the booms are cranked out
B.periodically removed for inspection and lubricated
C.replaced at each inspection for certification
D.in the locked position after the boat is cradled and griped down

單項(xiàng)選擇題

The part of a windlass which physically engages the chain during hauling or paying out is the（）.

A.devil's claw
B.bull gear
C.wildcat
D.cat head