专用调度系统用户线绝缘电阻及馈电电流分别不小于()。
A.10kΩ,10mA
B.15kΩ,15mA
C.20kΩ,18mA
D.30kΩ,25mA
参考答案:C
将函数f(x)=ex展开为x的幂级数,并求出收敛区间.(e=2.718为自然对数的底)
同义句转换。
1. I am fine.
I am_________.
2. Beijing is bigger than Shijiazhuang.
Shijiazhuang is ________ than Beijing.
3. I want an envelope, please.
I _________ an envelope, please.
4. Where are you going to send your letter?
Where ________ you ________ your letter?
5. What's the price of the camera?
________ ________ is the camera?