was covered
题目
was covered
答案
意思 :被……盖满;充满着……例句:The wounded man was covered with blood.这个受伤的人身上全是血.I say it is special because the dinosaur was covered with feathers.我说它特别是因为这恐龙是被羽毛覆盖着...
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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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