A．AllB．EitherC．NeitherD．Both
All
B. Either
C. Neither
D. Both
What do we learn from the passage？
A. The music is played in concerts．
B. The music is played only in restaurants and stores．
C. The music is comparable with modern pop music．
D. The music put you in a right mood．
What does the woman think of background music？
A. She likes background music．
B. She plans to write background music for some company
C. She often sits down to listen to background music．
D. She doesn' t agree with the man on background．
图示变压器，一次额定电压U1N=220V，一次额定电流，I1N=11A，二次额定电压U2N=600V。该变压器二次电流额定值I2N约为()。
A. 1A
B. 4A
C. 7A
D. 11A
微信支付 
支付宝支付