关于产前诊断哪项不对（） A.性染色质或核型分析可诊断胎儿性别_爱下问搜题

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问题单项选择题 A1/A2型题

关于产前诊断哪项不对（）

A.性染色质或核型分析可诊断胎儿性别

B.可用染色体分析诊断21-三体

C.可用PCR技术诊断Down＇s综合征

D.可用酶学方法诊断18-三体

E.可用酶学方法诊断某些代谢性疾病

答案

参考答案：D

补全对话，情景问答

根据对话内容，选用方框中适当的句子补全对话。

A. Which bus goes to the hospital?
B. This little girl brought me here.
C. You can take a bus.
D. The No. 3 bus will take you there.
E. Let's ask this policeman.
F. It'll take you about half an hour.
G. We'd better take a bus.

A: How can I get there? I don't know the way. 　　
B: 1.           He may know. Excuse me! Which is the way to the North Hospital? 　　
C: Go down this street until you reach the second traffic lights. Turn right. At he end of the road you'll see
   the hospital. 2.            　　
B: Half an hour? That's too long! Is there a bus? 　　
C: Yes. 3.             　　
B: Thanks a lot. Granny, the hospital is not very near. 4.           I'll go with you. 　　
A: How kind! Thank you. 　　
(Twenty minutes later. In the hospital the woman finds her husband.)　　
D: But how did you get here? 　　
A: By bus. 5.           　　
D: Which girl? I must thank her!

问答题计算题

变形区长度L=90mm，压下量Δh＝27mm，求轧辊工作直径。