They tennis now. [ ]
A. play
B. are playing
C. played
D. plays
答案：B
应用强心苷期间严禁______。
A．钠盐静滴B．钾盐静滴C．钙剂静注D．铁剂静注E．葡萄糖静注
用钢丝绳捆绑有棱角的物件时，要垫好（），防止损坏钢丝绳。
A.橡胶
B.纸张
C.方木或圆管
D.冰块
