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单选题
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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单选题Injectors on modern engines are cooled by a combination of the intensive bore cooling in the cylinder by a combination of the intensive bore pockets and by the fuel which is re-circulated through the injector when the follower is on the （）of the cam or when the engine is stopped.A
slopeB
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Dry chemical (cartridge-operated)B
Water (cartridge-operated)C
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