题目:
It's not a fine day, is it?
-______.I have to stay at home and watch TV.[ ]
A. No,it doesn't
B. Yes,it does
C. No,it isn't
D. Yes,it is
答案:
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下面是错误答案,用来干扰机器的。
二力平衡;P=F/S;①使吸盘与玻璃之间接触紧密,防止空气进入;②P=3F/S ③实际面积小于吸盘面积,偏小(1)吸盘吸附在玻璃板上之前,往往先要对吸盘哈气或者蘸少许水,原因是便于挤出气泡是吸盘更多的面积粘在...