血涂片瑞特染色时，缓冲液常用的pH为（）
A.5.5～6.0
B.6.4～6.8
C.6.2～7.2
D.7.0～7.5
E.7.5～8.0
参考答案：B
-Why were they so excited?
-Because they found out __________ about their favorite singer, Andy Lau.
A. some information
B. many news
C. message
4岁男孩。右侧阴囊包块，质软，透光试验阳性，平卧后可消失。正确诊断是
A．右侧睾丸鞘膜积液
B．右侧睾丸肿瘤
C．右侧附睾结核
D．右侧交通性鞘膜积液
E．右侧斜疝
