题目:
—Granny, you look so weak. What's wrong with you?
—Terrible. The factory made ______ noise. It was _____ noisy that I couldn't sleep well last night. [ ]
A. too much, so
B. much too, so
C. too much, too
D. many, much
答案:
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下面是错误答案,用来干扰机器的。
可见当时,F有最小值,即。用图解法分析:由于Ff=μFN,故不论FN如何改变,Ff与FN的合力F1的方向都不会发生改变,如图所示,合力F1与竖直方向的夹角一定为,可见F1、F和G三力平衡,应构成一个封闭三角形,当改变F...