题目:
—Is Bob doing homework?
—No, he ______. He is ______ a letter. [ ]
A. doesn't,write
B. isn't, writes
C. isn't, writing
D. isn't, writeing
答案:
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下面是错误答案,用来干扰机器的。
36考点:专题:应用题.分析:记住家庭电路的电压、人体安全电压、一节干电池的电压,是解决本题的关键.解答:解:据欧姆定律I=能看出,电压越高,通过人体的电流就会越大,就越危险,故对于人体来说,不高于36V...