题目内容
《道路旅客运输企业安全管理规范(试行)》中规定，客运站管理要 “三不进站、六不出站”及“三封闭”发车， 其中“三封闭”为 () 、() 、() 。
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由于销售成本等方面的差异，通常()渠道的产品费率更低。
扁炒青的品质要求：扁平光滑。因制法不同，()也有差异。
In teaching a lesson on the concept of thirds, Ms. Chu uses a divide-and-set-aside procedure. She starts with acertain number of colored disks, divides them into 3equal groups, and sets 1group aside to illustrate 1/3.She repeats the procedure by taking the disks she hadNOT set aside, dividing them into 3equal groups, andsetting 1of these groups aside. If Ms. Chu wants to beable to complete the divide-and-set-aside procedure at least 4times (without breaking any of the disks intopieces), which of the following is the minimumnumber of colored disks she can start with？
证券组合管理强调构成组合的证券应多元化。因为证券组合的风险随着组合所包含证券数量的增加而()，尤其是证券间关联性极低的多元化证券组合可以有效地降低非系统风险，使得证券组合的投资风险趋向于市场平均风险水平。
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