单选题The engine has one or two group of fuel pumps, depending upon （）.Athe number of fuel valvesBthe number of cylindersCthe speed of engineDthe power of engine
单选题
The engine has one or two group of fuel pumps, depending upon （）.
A
the number of fuel valves
B
the number of cylinders
C
the speed of engine
D
the power of engine
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