If a four-stroke/cycle diesel engine is started by injecting air into the cylinder, the pistons receiving the charge of starting air must be（）<br>A:on the power stroke<br>B:on the exhaust stroke<br>C:at the end of the power stroke<br>D:at the start of the intake stroke

If a four-stroke/cycle diesel engine is started by injecting air into the cylinder, the pistons receiving the charge of starting air must be（）
A:on the power stroke
B:on the exhaust stroke
C:at the end of the power stroke
D:at the start of the intake stroke

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