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
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对失效、变质、残损的材料的评估应()。
A. 有无实际效用确定评估值
B. 有无实物存在为原则进行评估
C. 直接认定为零
D. 扣除贬值额后确定评估值
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