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)
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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
所谓“互锁”是指当一个继电器工作时，另一个继电器不能工作，避免。
A. 短路
B. 开路
C. 断路
D. 回路
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