單項(xiàng)選擇題You must take good care of the drainage cock of the air control systemBecause () leads scale formed which might malfunction the pilot control valve and other instruments.

A.the temperature
B.the rust
C.the pressure
D.the humidity


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1.單項(xiàng)選擇題You increased the () to 150 tons that’s why the fuel oil ().

A.pumped speed;came out
B.pumping rate;overflowed
C.flowing rate;leaked out
D.flowed speed;spilled out

2.單項(xiàng)選擇題Worn out ring grooves should be () to standard dimension after being welded.

A.machined
B.bored
C.honed
D.drilled

3.單項(xiàng)選擇題With VIT unit the timing of fuel injection of an engine can be regulated automatically according to the ().

A.ship draft
B.pitch
C.engine load
D.oil viscosity

4.單項(xiàng)選擇題With VIT the start of injection may be () as the engine load is reduced within a certain range.

A.advanced
B.retarded
C.relayed
D.cut off

5.單項(xiàng)選擇題With Variable Injection Timing the start of injection may be ()as the engine load is reduced.

A.advanced
B.retarded
C.kept constant
D.none of the above