單項(xiàng)選擇題The diesel engine must be started before it can run by it self For this purpose () has to be used.

A.a starting system
B.the starting air
C.a starting operation
D.A, B and C


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2.單項(xiàng)選擇題The diesel engine is a type of ().

A.turbine engine
B.gas turbine
C.steam engine
D.internal combustion engine

3.單項(xiàng)選擇題The diameters of the crankpins should be measured using ().

A.a micrometer
B.a bridge gauge
C.a spanner
D.a wrench

5.單項(xiàng)選擇題The diameter of the crank-pins should be measured with a ().

A.salinometer
B.thermometer
C.tachometer
D.micrometer