在备份模式下,对MGW进行格式化C盘操作的相关指令为()
A.format/c2
B.formathd/c
C.format/c
D.formathd/c2
参考答案:D
Many students didn't realize the importance of study ____ they left school. [ ]
A. when
B. until
C. as
D. after
采用电雷管进行大爆破起爆时,装药前应检测爆区内的杂散电流。杂散电流超过()时,应采取降低杂散电流强度的有效措施,或改用非电起爆系统。
A.30mA
B.50mA
C.100mA
D.150mA