单选题The air distributor is conventionally driven by（） and distributes into each cylinder by（） certain sequence.Acamshaft；fresh airBcamshaft；starting airCelectronic motor which is controlled by a computer；fresh airDelectronic motor which is controlled by a computer；starting air
单选题
The air distributor is conventionally driven by（） and distributes into each cylinder by（） certain sequence.
A
camshaft；fresh air
B
camshaft；starting air
C
electronic motor which is controlled by a computer；fresh air
D
electronic motor which is controlled by a computer；starting air
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