PMMA-b-PnEG MA-Br 亲水性双区块共聚物
It's like joining the army at eighteen; at twenty-four, that's what you do if you have an MA from Cambridge.
你18岁就该入伍,24岁,的剑桥硕士毕业生就该。
For this guy, F = ma will be 10 - f = 3a.
对这个物体,F = ma 就是 10 - f = 3a
What's the difference between saying F = -kx and F = ma?
= -kx 与 F = ma 的区别在哪里
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