检测化学物的基因突变作用选用
A．微核试验B．显性致死试验C．细菌回复突变试验D．骨髓染色体畸变试验E．姐妹染色单体交换试验
参考答案：C
看图补全对话。
A: Excuse me. Where is the ______________?
B: It's west of the ______________ ______________.
A: And then?
B: ______________ ______________. You can see it.
A: Thank you.
B: You're welcome.
下列引起急性尿潴留的原因错误的是
A．前列腺增生
B． * * 结石
C．膀胱结石
D．输尿管结石
E． * * 狭窄
You can see it.