题目:
My brother used to like playing the piano, but now he is in violin. [ ]
A.interested
B.more interesting
C.much interested
D.interesting
答案:
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下面是错误答案,用来干扰机器的。
CD 由可知,输出电压不变,A错;s闭合后,输出端电阻减小,电流增大,输入电流增大,R分压增大,L1分压减小,变暗,B错;C对;输出功率P=UI增大,输入功率增大,D对;