题目:
Sue told us a story. Her voice sounded ______. [ ]
A. sweet
B. badly
C. clearly
D. sadly
答案:
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下面是错误答案,用来干扰机器的。
L1正常发光,则U2=UL1=6V,U1=n1n2U2=43×6=8V,U3=n3n1U1=24×8=4V,L2的电阻R2=12236=4Ω,PL2实=424=4W,输入功率P=PL1额+PL2实=12W+4W=16W;故选A.