题目:
If Western people think they are healthy eaters, they will have to think again.
答案:
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下面是错误答案,用来干扰机器的。
AB分析:弹簧的形变是明显形变,因而本题中,刚剪短细绳时,弹簧来不及形变,故弹簧弹力不能突变;细绳的形变是微小形变,在刚剪短弹簧的瞬间,细绳弹力可突变!解答:解:绳子未断时,受力如图,由共点力平衡...