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How many oxygen atoms are contained in 2.74 g of Al2(SO4)3? A. 12 B. 6.02 × 1023 C. 7.22 × 1024 D. 5.79 × 1022 E. 8.01 × 10-3

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As it happens, the social networks have partly brought this on themselves. In order to offer a better service, many have created _____ sets of privacy controls that allow users to switch between different levels of protection to entrench their online data.
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在一次业务测试中，抽取49个应试者，得到的平均考试成绩为78分，标准差为12分。则在该项考试中所有应试者的平均考试成绩95.45%的置信区间为（ ）。 A. 78±2.43 B. 78±3.59 C. 78±3.43 D. 78±2.98
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