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问题 单项选择题

为了使数字电压表稳定工作，不因为放大器和其他元器件温度漂移而影响电压表的精度，因此必须保证仪表预热（）以上，才能进行测量工作。

A.五分钟 

B.十分钟 

C.十五分钟 

D.半小时

答案

参考答案：D

单项选择题

精索神经纤维瘤

A．将插管向输卵管开口处插入0.5cm左右
B．探宫腔
C．从插管中缓慢注入复方苯酚糊剂
D．将外套管及插管放入宫腔，达宫底后滑入宫角
E．注入生理盐水8～10ml问输卵管药物粘堵术的步骤
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单项选择题

Woman: Excuse me, but could you tell me where I can change American dollars into British pounds
Man: There’s a bank around the corner. But I am afraid it’s already past its closing time. Why don’t you try the one near the railway station
Question: What does the man mean（）。

A. The woman should try her luck in the bank nearby.

B. The bank around the corner is not open today.

C. The woman should use dollars instead of pounds.

D. The bank near the railway station closes late.
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