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

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

1.單項選擇題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

2.單項選擇題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

3.單項選擇題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

4.單項選擇題With the shell and cap assembled as for running, a check must be made that the clearance between the cap and the housing （）.

A.has a nip
B.is large enough
C.is zero
D.are suitable

5.單項選擇題With the crank in position in the engine, some measurements can be taken by a special bridge gauge and （）.

A.a micrometer
B.a bowl
C.a feeler gauge
D.a wrench