The girl ______ an English song in the next room is Tom's sister.
A. who is singing
B. is singing
C. sang
D. was sing
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-----"How do you like the book?"-----“It's quite different from ______ I read last month."
A. that
B. which
C. the one
D. the one what
Anyone _______ this opinion may speak out.
A. that againsts
B. that aganist
C. who is against
D. who are against
在各种互补功率放大电路中,电源利用率最高的是( )。
A. OCL功放
B. OTL功放
C. BTL功放
OTL功放输出端公共发射极的直流电位为电源电压的一半。()
A. 对
B. 错