隧洞施工掘进用光爆法施工最主要的特点是（）。
A．减少断面一次炸药耗量
B．减少超挖
C．降低打点工作量
D．排渣方便
参考答案：B
Look at the sweat on her face.She________the house since she got up this morning.[ ]
A. is cleaning
B. has been cleaned
C. was cleaning
D. has been cleaning
醋酸地塞米松片剂
A．两步滴定法B．高效液相色谱法C．柯柏反应比色法D．紫外分光光度法E．四氮唑比色法 下列药物及其制剂的含量测定方法分别是
