A.fuel valves of main engine
B.injector pump of main engine
C.safety valves of marine boiler
D.safety valves of a reciprocating pump
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A.a mechanical seal
B.keyway and key
C.a nut
D.shrinkage
A.the thrust pads are while metal faced on both sides
B.the thrust pads are while metal faced only on the forward side
C.the thrust pads are while metal faced only on the after side
D.intermediate shaft usually supported by a plummer block
A.high speeds
B.medium speed
C.low speeds
D.the same speed with the engine
A.check oil level in bearing sump
B.check them for leakagec through end seals
C.pump bilges in time
D.check temperature
A.the after one is more than forward one
B.the forward one is more than after one
C.the forward one is the same with after one
D.it depends on the type of engine
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To proceed to the assistance of a ship in distress is（）
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