某家庭电路中接有一台100W的电冰箱，两个40 W的白炽灯，再要使

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问题选择题

某家庭电路中接有一台100W的电冰箱，两个40 W的白炽灯，再要使用一个20W的台灯，每当台灯的插头插进插座时，电路里1A的保险丝就熔断，发生这一现象的原因是 [ ]

A．用电器总功率过大

B．白炽灯有损坏

C．台灯的插头处有短路

D．电冰箱的功率突然增大

答案

答案：C

单项选择题

The sample mean is a consistent estimator of the population mean because the:（）

A. expected value of the sample mean is equal to the population mean.

B. sampling distribution of the sample mean has the smallest variance of any other unbiased estimators of the population mean.

C. sample mean provides a more accurate estimate of the population mean as the sample size increases.

名词解释

计算机及网络犯罪