原地爆破浸出一般先采出()%的矿石，对余下的矿体采用微差挤压爆破等方法，将矿石按规定的矿块粒度要求进行崩落。
查看答案
油管输送射孔枪可以和各种套管测试工具(MFE、PCT、APR等)相配合、组成射孔一测试联合作业管柱。()
Which of the following statements concerning fuel atomization in a diesel engine cylinder
A. The greater the atomization, the greater the penetration
B. The greater the atomization, the less the penetration
C. The degree of atomization has nothing to do with the degree of penetration
D. Atomization and penetration are one and the same
MFE测试关井时，上提换位操作时，旁通阀因向上延时作用保持开启，安全密封受压差影响对封隔器起液压锁紧作用，封隔器保持密封。()
微信支付 
支付宝支付