The starting air entering the cylinder begins when the piston .A.has nearly come to the TD

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The starting air entering the cylinder begins when the piston .

A.has nearly come to the TDC

B.has just past the TDC

C.has nearly come to the BDC

D.has just past the BDC

请帮忙给出正确答案和分析,谢谢!

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