Because the timing of injection is crucial, （） mounted on the camshaft, which is driven by the crankshaft are used to operate the fuel pumps, one of which is provided for each cylinder.<br>A:gears<br>B:rams<br>C:barrels<br>D:cams

Because the timing of injection is crucial, （） mounted on the camshaft, which is driven by the crankshaft are used to operate the fuel pumps, one of which is provided for each cylinder.
A:gears
B:rams
C:barrels
D:cams

出自：海船船员证

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