Re-circulating the fuel when the engine is stopped can______.①keep the fuel at the correct viscosity ②cool the injectorA.①B.②C.①②D.neither ① nor ②

题目

Re-circulating the fuel when the engine is stopped can______.①keep the fuel at the correct viscosity ②cool the injector

A.①

B.②

C.①②

D.neither ① nor ②

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