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单选题
Before starting a diesel engine, you should always（）
A
check the pyrometer readings
B
check the crankcase oil level
C
check the fuel oil strainers
D
clean the fuel system
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take inB
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单选题Which of the following should always be checked prior to starting a diesel engine?（）A
Air filtersB
Fuel oil strainersC
Crank case oil levelD
Pyrometer readings
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2B
3C
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A, B and C
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