A.5
B.3
C.2
D.1
第1题
A.alkalescence
B.acidity
C.salinity
D.impurity
第2题
A.regulating the oil flow with the six-way valve
B.moving the automatic differential valve
C.moving the receiving tele-motor which regulates the two-way valve
D.varying the angle of a tilting box or eccentricity of a floating ring
第3题
A.slightly acidic
B.slightly alkaline
C.no salty
D.slightly bitter
第4题
A.plugging all scuppers and drains
B.placing floating booms around the ship
C.regularly emptying all drip pans
D.thoroughly draining all bunkering hoses
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