(),可采用杀精剂避孕。
A.对杀精剂过敏
B. * * 急性炎症
C.子宫颈陈旧性撕裂伤
D.子宫脱垂
E. * * 壁松弛
参考答案:C
________ the jewels were locked in a strong box,the thieves stole them without any difficulty.
A.If
B.Unless
C.Although
D.Because
管理间子系统有3种交连方式,它们是()、单点管理双交连和双点管理双交连。