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1年前
A person who has never tasted bitter won’t know ______ sweet is.
1年前
My house has three _______ . It has enough_______ for you to hold a dance party here.
1年前
—What about having a picnic tomorrow morning?
1年前
在10-9-10-7m范围内,对原子、分子进行操作的纳米超分子技术往往能实现意想不到的变化.如纳米铜颗粒一遇到空气就会剧烈燃烧,甚至发生爆炸.下列说法中正确的是( )
1年前