【单选题】【消耗次数：1】
设函数<imgwidth="36"height="21"v:shapes="_x0000_i1221"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb07.files/image288.png">在区间<imgwidth="36"height="21"v:shapes="_x0000_i1222"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb07.files/image340.png">上等于<imgwidth="35"height="19"v:shapes="_x0000_i1223"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb07.files/image342.png">,而在此区间外等于0;若<imgwidth="36"height="21"v:shapes="_x0000_i1224"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb07.files/image288.png">可以作为某连续随机变量的概率密度函数,则区间<imgwidth="36"height="21"v:shapes="_x0000_i1225"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb07.files/image340.png">为（）
①
<imgwidth="40"height="41"v:shapes="_x0000_i1226"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb07.files/image344.png">
②
<imgwidth="37"height="21"v:shapes="_x0000_i1227"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb07.files/image346.png">
③
<imgwidth="54"height="42"v:shapes="_x0000_i1228"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb07.files/image348.png">
④
<imgwidth="48"height="42"v:shapes="_x0000_i1229"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb07.files/image350.png">
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任意正实数
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1
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<imgwidth="84"height="25"v:shapes="_x0000_i1198"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb08.files/image293.png">
②
<imgwidth="92"height="25"v:shapes="_x0000_i1199"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb08.files/image295.png">
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<imgwidth="88"height="41"v:shapes="_x0000_i1200"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb08.files/image297.png">
④
<imgwidth="96"height="41"v:shapes="_x0000_i1201"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb08.files/image299.png">
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