该电路的电压放大倍数为（）。
A.-120
B.-200
C.-300
D.-60
参考答案：A
Because the first pair of shoes did not fit properly, I asked for _____. [ ]
A. another shoes
B. another one
C. the others ones
D. another pair
下列物质中既含有共价键又含有离子键的是( )
A．NaI
B．CaCl2
C．NO2
D．KNO3
