【单选题】【消耗次数：1】
我国医院分级管理规定，三级医院的病床数不得少于
①
50张
②
100张
③
300张
④
500张
参考答案：
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相关题目
【单选题】
有100张卡片（从1号到100号），从中任取一张，取到的卡号是7的倍数的概率为（ ）
①
<img class="kfformula" src="20190809/1565330760695228.png" data-latex="\frac {7} {50}" width="75" height="53"/>
②
<img class="kfformula" src="20190809/1565330760810107.png" data-latex="\frac {3} {20}" width="68" height="53"/>
③
<img class="kfformula" src="20190809/1565330760716247.png" data-latex="\frac {7} {100}" width="76" height="53"/>
④
<img class="kfformula" src="20190809/1565330760831846.png" data-latex="\frac {7} {48}" width="68" height="53"/>
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