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A: I’ve come across some dates in my reading and each of them refers to some important events. Suppose I give you a few dates and you’ll try to guess what dates they are.B: OKA: ___________________________________B:Oh, that was the day when Columbus first landed in America.
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5、图形对某一轴的静矩为零，则该轴必定通过图形的形心。
6、有一定面积的图形对任一轴的轴惯性矩必不为零。
A: How did Susan strike you?B: Oh, she made a good impression on me. I like the way she spoke.A: She spoke in an amusing way, didn’t she?B: __________________________________
A: ___________________________________B: Yes. A kitchenette is a small room where people cook their meals.A: ___________________________________B:Of course. That means the same thing.
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