In a diesel engine, when refitting piston rings you should （）
Ⅰ.check the ring gap at the smallest diameter of the cylinder
Ⅱ. Remove carbon from the ring groove
A.Ⅰ only
B.Ⅱ only
C.both Ⅰ and Ⅱ
D.neither Ⅰ nor Ⅱ
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In a diesel engine, an integral liner is one in which the cooling water （）
Ⅰ.flows through the cylinder liner jackets
Ⅱ.touches the outer side of the liner
A.Ⅰ only
B.Ⅱ only
C.both Ⅰ and Ⅱ
D.neither Ⅰ and Ⅱ
A.piston rings
B.valve guides
C.valve seals
D.all of the above
A.excessively late fuel injection
B.oil in the air charge
C.water in the fuel
D.injection continuing after the fuel charge is ignited
A.injection pump plungers stuck or worn
B.low compression
C.solenoid stuck open
D.fuel tank too full
A.facilitate bi-directional operation
B.provide the greatest pump efficiency
C.prevent pump clogging from marine growth
D.prevent cavitation at the pump outlet
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The shipboard oil pollution emergency plan will be invalid after （）
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Using a file without a handle may result in （）
If separating effect is not good, which measure should be taken （）
The Port State Control officer may witness a fire drill carried out by the crew assigned to these duties on the（）
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（） is not installed on the main switchboar.