the planes were open to the air so passengers had to wear special clothing ang shoes 里面的be open to
题目
the planes were open to the air so passengers had to wear special clothing ang shoes 里面的be open to
答案
对..敞开..暴露于..下
所以句子的意思就是 这些飞机曾暴露于空气中(这个我不大理解..)所以乘客需要穿特殊的衣服和鞋子
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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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