你可能感興趣的試題

Manila lines in which the strands are right-hand laid（）.

A.should be coiled in a clockwise direction
B.should be coiled in a counterclockwise direction
C.may be coiled either clockwise or counterclockwise
D.should never be coiled

單項(xiàng)選擇題

Limit switches on gravity davits should be tested by（）.

A.the engineers，from a panel in the engine room
B.shutting off the current to the winch
C.pushing the switch lever arm while the winch is running
D.All of the above