单选题If a four-stroke/cycle diesel engine is running at 1550 RPM, the speed of the camshaft will be（）.A525 RPMB775 RPMC1550 RPMD1800 RPM
单选题
If a four-stroke/cycle diesel engine is running at 1550 RPM, the speed of the camshaft will be（）.
A
525 RPM
B
775 RPM
C
1550 RPM
D
1800 RPM
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