In a four-stroke cycle diesel engine the intake valves open （）<br>A:before TDC and close after BDC<br>B:after TDC and close after BDC<br>C:before TDC and close before BDC<br>D:after TDC and close before BDC

In a four-stroke cycle diesel engine the intake valves open （）
A:before TDC and close after BDC
B:after TDC and close after BDC
C:before TDC and close before BDC
D:after TDC and close before BDC

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