题目内容
______is the study and use of electrical devices that operate by controlling the flow of____or other _____ charged particle in devices such as vacuum tube and semiconductors.
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One of the best known computer ____ which are very widely used in research, design and training is the flight ____upon which pilots receive much of their training.
It follows that we can use the one table tor the standard normal for all calculations involving normal __________.
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.
Signals are sent to____ to_____.
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