题目内容

It follows that we can use the one table tor the standard normal for all calculations involving normal __________.

A. varying
B. variates
C. variation
D. various

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There are two approaches to measuring the ____of random variables around their central values. The most important such measure is the____, a weighted sum of sequential differences between the possible values and the mean.

A. variation varying
B. varyingvariation
C. variance variation
D. variation variance

Signals are sent to____ to_____.

A. amplifyingamplifiers
B. amplifiersbeamplified
C. amplifiersamplify
D. beamplifiedamplifiers

西班牙的气候类型主要有种。

A. 4
B. 5
C. 6
D. 7

西班牙的大陆性气候主要位于西班牙。

A. 东部
B. 中部
C. 南部
D. 北部

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