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As Zhong Nanshan puts it, a surgical mask is enough _______ one uses it for daily protection.
6天前
I ________ in the city since I left school. I like this city very much now.
5个月前
剪刀、斧头要磨得锋利是通过______受力面积,而______压强.
1年前
大学物理习题,求均匀带电球面内外的电场和电势分布,已知球面的半径为R,总电量为Q
1年前
绘制三维曲面z=sin(x)cos(y)图中的z>0.35 部分图形,其中0≤x,y≤2π.用matlab画
1年前