孔径小于75mm、孔深小于5m的钻孔爆破称为( )。
A．浅孔爆破
B．深孔爆破
C．洞室爆破
D．光面爆破
参考答案：A
There ___________ a cat and two birds in the tree just now. [ ]
A. were
B. has
C. is
D. was
针灸的治疗原则，“热”则应该采取（）
A.泄之
B.除之
C.泻之
D.留之
E.疾之
