若三相四线制线电压为380V,灯泡接在相电压上,若C相不亮(熔丝断),此时用电压表测量UAB为()。
A.220V
B.380V
C.0V
D.-220V
参考答案:B
I_______ the piano for two years.
A.have bought
B.will buy
C.am buying
D.have had
What was it ________ he was so eager to get?
A.what
B.that
C.why
D.how