题目内容

lt is difficult to estimate the number of people doing part-time jobs o____. (作为兼职;秘密)

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The president has a____his foreign minister, Mr. Burns, to act as representative to the international conference to be held in Tokyo next month. (批准;委托)

Advances in telecommunications have meant that it is just as easy to work from a computer t____at home as it is from a town center office. (终端机)

也叫试凑法，是利用自己或别人的经验进行程序设计。

A. 经验设计法
B. 继电器图替换法
C. 时序图设计法
D. 逻辑设计法

依靠继电器自身常开触点使其线圈保持通电的作用称为。

A. 自锁
B. 互锁
C. 闭锁
D. 开锁