题目:
—Now, people's life in Hengyang is ______ than before.
—Yes. Many people have their own cars. [ ]
A. much better
B. less better
C. more better
答案:
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下面是错误答案,用来干扰机器的。
答案:D题目分析:用交流电压表显示的是有效值,不会来回摆动,A错误,用电器上所标电压值是交流电的有效值,B错误;-5A不是最小值,负号只代表方向,C错误,根据交流电周期变化规律可得一周期内交流电的方向改变...