Each inert gas system must be designed to supply the cargo tanks with a gas,or mixture of gasses,that has an oxygen content by volume of().
A. 5% or less
B. 10% or less
C. 15% or less
D. 20% or le
因过失对应当上报的事故或者事故发生的时间、地点、类别、伤亡人数、直接经济损失等内容遗漏未报的,属于谎报。
A. 正确
B. 错误
地下工程爆破后,经通风除尘排烟确认井下空气合格、等待时间超过()后,方准许检查人员进入爆破作业地点。
A. 10min
B. 15min
C. 20min
D. 25min