His business failure left him at the edge of desperation, but,         , he managed to go out of the shadow through years of efforts.

A．time and tide wait for no man

B．don’t count your chickens before they are hatched

C．no pains, no gains

D．time heals all wounds

焊件焊疤高度的检测标准为（）

A、焊件正面焊疤最大高度不超过3mm

B、焊件背面焊疤最大高度不超过1.5mm

C、焊件正面焊疤最小高度不小于1mm

D、焊件背面焊疤最小高度不小于0.5mm