He likes           out along the river with his wife on weekends. [ ]

A. hang

B. hung

C. hanging

D. hunging

对注射用无菌粉末描述，不正确的是( )。

A．为无菌的干燥粉末或海绵状物
B．对热不稳定或易水解的药物宜制成此剂型
C．生产必须采用无菌操作法
D．简称粉针剂
E．无菌粉末必须采用冷冻干燥法制备