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问题 选择题

在相同的时间内，电热丝甲比电热丝乙放出的热量多，这是因为[ ]

A. 甲的阻值比乙大

B. 甲中的电流比乙大

C. 甲两端的电压比乙两端电压大

D. 甲消耗功率比乙消耗功率大

答案

答案：D

单项选择题

国际上根据饭店客房数量划分饭店的类型，一般小饭店的客房数量是（）。

A.200间

B.300间

C.150间

D.100间
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单项选择题

An analysis determined that approximately 99 percent of the observations of daily sales for a company were within the interval from $ 250000 to $ 580000 and that daily sales for the company were normally distributed. The mean daily sales and standard deviation of daily sales, respectively, for the company were closest to: Mean daily sales Standard deviation of daily sales（）

A. $ 415000 $ 41667

B. $ 415000 $ 55000

C. $ 355115 $ 41667
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