单项选择题
The injector pump is operated by a cam which drives （） up and down.
A.the needle valve
B.the plunger
C.the piston
D.the cylinder
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The indications of a scavenge fire are excessive black smoke, （） and peeling from scavenge trunking.
A.turbo-chargers surge
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The indicated power of an engine can be obtained by taking the （）.
A.precautions
B.rpm
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