起爆药包位于柱状装药的里端,靠近或在炮眼底,雷管底部朝向炮眼口的起爆方法是()。
参考答案:反向装药
水管锅炉与烟管锅炉相比,()是不对的。
A.蒸发率较大
B.相对体积、重量较小
C.效率较高
D.对水质要求较低
As citizens of our country, it is our duty and responsibility to _______ the legal rights of our own in the election.
A.stand up for
B.stand out
C.stand by
D.stand up