Why will they pay someone to work for them next time? Because they ______ .
A.don't want to do the work themselves any more
B.have no paint and burshes
C.want to save money
第5题
炮孔或群药包之间以一定的时间间隔按一定顺序起爆的爆破方法有____。
A 延期爆破
B 秒延期爆破
C 毫秒爆破
D 瞬时爆破
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