设，且二阶可导，求

若，则．

设为可导函数，，则．

下图形象地刻画了1936年美国电影《摩登时代》的主题。该电影(　　)

已知函数．
（Ⅰ）在下图中画出的图象；
（Ⅱ）求不等式的解集．

    Should Shanghai bid for (申办) the Summer Olympics in 2028? Here are some people’s opinions.
    Some people said, “The games will improve Shanghai’s global influence and the city is powerful and must try to become a platform (平台) for major international dialogues. Shanghai has succeeded in holding the World Expo in 2010 and the city can also hold a successful Summer Olympics.” 
    Others, however, are not sure that it’s a good idea. They think the Olympics would be too expensive and the money could be better spent on other things.
    The 2008 Beijing Olympics brought much prestige (声望) to the city and to China, but its cost, over $40 million, was high and the Olympic site (场地) in the center of the city is now largely unused. Could Shanghai learn from Beijing’s experience and do it better?
    My answer is yes. As one American said, “A great city has to do great things.” Shanghai is a great city and is not afraid of facing challenges. Holding the 2028 Summer Olympics would prove that.

一半径为的无限长半圆柱薄筒，其上均匀带电，单位长度上的带电量为，如图所示。试求半圆柱面轴线上一点的电场强度。