铵油炸药适用场合:一般用于坚硬岩石,无水深孔爆破和大爆破。
参考答案:错
Don’t worry. Our teacher will come to show us ______the computer.
A.how can we use
B.what to use
C.how to use
D.what can we use
治疗伤寒的首选药是
A.四环素
B.氯霉素
C.青霉素G
D.庆大霉素
E.红霉素