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-Do you know her? -No. Her name rings a bell but I can't remember ________ I heard it before. [ ]
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The only thing_________ I want to do is to have a rest. [ ]
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Many men were b________ underground when the accident at the mine happened.
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小明家要砌一道30米,厚0.25米,高2米的砖墙,每立方米用砖520块,一共要用多少块砖?
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求曲线y=sinx在以下两点处的切线方程及法线方程:x=三分之π,x=二分之π
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