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问题 单项选择题

SE1-8卷烟机烟纸直径检测压力调节器RV11的空气压力为（）巴。

A.2

B.3

C.4

D.5

答案

参考答案：B

选择题
It was the third time that she ______ to this mountain village to see the children.
A. had come
B. has come
C. came
D. would come
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单项选择题

胰腺癌手术切除率低主要原因是（）。

A.癌恶性程度高

B.手术并发症多

C.癌早期发生浸润转移

D.早期诊断困难

E.病人年老、体弱
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