钻孔时，当钻尖快要钻穿工件时，应()钻尖下降速度
A.减慢
B.加快
C.保持不变
D.先慢后快
参考答案：A
—How did your father deal with you?
—We were lucky to ____ being punished.
A．admit
B．escape
C．consider
D．stop
有肝病或与异烟肼合用引起肝损害( )
A．利福平B．乙胺丁醇C．异烟肼D．链霉素E．吡嗪酰胺
