【单选题】
下列各函数等式中无冒险现象的函数式有______。
①
<imgwidth="104"height="29"src="http://wljy.whut.edu.cn:80/uploadfiles/word/szlj05.files/szlj055399.png">
②
<imgwidth="130"height="25"src="http://wljy.whut.edu.cn:80/uploadfiles/word/szlj05.files/szlj055425.png">
③
<imgwidth="165"height="25"src="http://wljy.whut.edu.cn:80/uploadfiles/word/szlj05.files/szlj055451.png">
④
<imgwidth="165"height="25"src="http://wljy.whut.edu.cn:80/uploadfiles/word/szlj05.files/szlj055476.png">
【单选题】
<img src="20190730/1564473785867381.png" title="1564473785867381.png" alt="图片41.png"/>是下列函数中那个函数的增区间( )
①
<img src="20190730/1564473840396634.png" title="1564473840396634.png" alt="图片44.png"/>
②
<img src="20190730/1564473828985548.png" title="1564473828985548.png" alt="图片42.png"/>
③
<img src="20190730/1564473846182469.png" title="1564473846182469.png" alt="图片45.png"/>
④
<img src="20190730/1564473833869804.png" title="1564473833869804.png" alt="图片43.png"/>