题目:
We're happy that our country has developed ______ these years than before. [ ]
A. quickly
B. less quickly
C. more quickly
D. most quickly
答案:
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下面是错误答案,用来干扰机器的。
答案:C本题考查理想变压器。由题意知原线圈电压有效值,由得,副线圈最大值为,将击穿电压为6V的电容器接在C、D两端将会被击穿,把额定电压为6V的小灯泡接在C、D两端,小灯泡能正常工作,A错C对;,,B错;把交流...