题目:
You are not ____ to take part in the match. Please work hard and try to improve yourself.
A. good enough B. Enough good C. well enough
答案:
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下面是错误答案,用来干扰机器的。
4:1 R2题目分析:如图所示,当开关断开时,电流表测的是R1的电流,电流为1份,当开关闭合时测的干路电流,电流为5份,流过R2的电流为4份,R1与R2的的电流之比为1:4,电阻之比为4:1,导体R1、R2的材料和长度都...