为什么雷雨天打开收音机听广播时，会有“咔嚓、咔嚓”的声音杂在节目中？

有个零件（正方体中间挖去一个圆柱形孔）如图放置，它的左视图是（　　）

增加：在缺词处加一个漏词符号(∧)，并在此符号下面写出该加的词；

删除：把多余的词用斜线(\)划掉；

修改：在错的词下划一横线，并在该词的下面写出修改后的词。

注意：1）每处错误及其修改均仅限一词；

2）只允许修改10处，多者(从第11处起)不计分。

    Two years ago, our math teacher offered us an answer at a difficult math problem in class. Although an answer seemed a little strange, but only I doubted it. Thought that his answer might be wrong, I carefully considered the problem and tried to work them out in a different way. Half an hour late, I finally managed find its correct answer. When I showed the answer to him, the teacher praised me for my independence thinking.

    From this experience I had already come to the conclusion whether questioning can serve as a bridge that helps us seek the truth.

已知集合$M=\left\{y|y=2^x,x>0\right\}$，$N=\left\{x|y=lg\left(2x-x^2\right)\right\}$，则$M\cap N$为（  ）