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【单选题】
He _____ play the piano since he was young. He is very famous now.A.
has could
B.
has been able to
C.
could
D.
was able to
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【简答题】函数的表示方法有哪几种?( )、( )、( )
【单选题】电路及参数如图所示,三极管为硅管,其 V BEQ =0.7V,设r o =∞,I o =10mA,R C1 =R C2 =1KΩ,V CC =12V,β1=β2=72,T 1 、T 2 、单管电压放大倍数均为-100, V i1 =3mV, V i2 =3mV,则空载输出电压 V o1 、 V o2 、 V o 分别为()
A.
7V, 7V, 14V
B.
4V, 4V, 0V
C.
-3V, -3V, -6V
D.
7V, 7V, 0V
【简答题】完形填空。 I am American. 1 name is Rose. I am twelve. I 2 two friends. They're 3 . 4 names are Mary and Betty. 5 all like sports. I 6 soccer ball. Mary likes 7 , too. Betty likes basketball. She 8 . six b...
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