阴囊包块，透光试验阳性，平卧后消失，多见于（）
A.睾丸鞘膜积液
B.精索鞘膜积液
C.交通性鞘膜积液
D.腹股沟斜疝
E.睾丸肿瘤
参考答案：C
There were more than five hundred competitors _____ part in the sports meet last week.[ ]
A. took
B. taken
C. taking
D. take
下列是软膏类脂类基质的是
A．植物油
B．固体石蜡
C．鲸蜡
D．羊毛脂
E．甲基纤维素
