关于在井下瓦斯工作面的钻眼爆破工作,做法正确的是()。
A. 两段毫秒雷管问的间隔时间不得超过130毫秒
B. 雷管的总延期不准超过130毫秒
C. 一次使用不同厂家的雷管时其雷管的品种必须相同
D. 井下使用火雷管必须配合使用导爆索
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中枢神经系统的某些功能障碍也会导致学习技能的困难。()
A. 正确
B. 错误
国务院可以通过行政法规的形式设定各种税务行政处罚。()
A. 正确
B. 错误
一般进口汽车起动机云母片低于钢片,其深度不得()mm。
If more than one raft is manned after the vessel has sunk,you should().
A. Go in a different direction in search of land
B. Spread out to increase the possibility of a search aircraft finding you
C. Reduce the number of rafts by getting as many people as possible into as few rafts as possible
D. Tie the rafts together and try to stay in a single grou