Your sister had a bad cold, ______ she? [ ]
A. wasn't
B. doesn't
C. hadn't
D. didn't
答案:D
治疗丹毒首选的拔罐法是()
A.留罐法
B.走罐法
C.留针拔罐法
D.刺血拔罐法
E.闪罐法
下列设备中,()的形式、运行条件、压缩工质对冷冻机油的选用都有影响。
A.油泵
B.压缩机
C.冷凝器
D.蒸发器