單項(xiàng)選擇題

A.prevent an unsafe ship proceeding to sea
B.prevent a ship threatening the marine environment
C.fine the ships
D.confirm a safe sailing

你可能感興趣的試題

A.means of rheostat the governor settings
B.a balance coil excitation
C.adjusting the governor settings
D.changing excitation

A.centrifuging
B.pressurizing
C.atomization
D.igniting