根据句意及所给首字母提示完成句中所缺的单词
题目
根据句意及所给首字母提示完成句中所缺的单词
1.With tears in her eyes,she was u____ to say a word.
2.Sound travels at the s____ of 340 metres a second.
答案
With tears in her eyes,she was unable to say a word.
2.Sound travels at the speed of 340 metres a second
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已知函数f(x)=x,g(x)=alnx,a∈R.若曲线y=f(x)与曲线y=g(x)相交,且在交点处有相同的切线,求a的值和该切线方程.
我想写一篇关于奥巴马的演讲的文章,写哪一篇好呢?为什么好
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