以555定时器构成的单稳态触发器这一典型电路为基础自制一种实用测试器，较详细的分析了该器件的工作原理、耦合方式、使用方法。
A tester is made based on the typical circuit of the monostable trigger made of 555 timers. It operation principle, coupling way and usage are analysed in great detail.
每位获选之参加者，必须于事先安排的电话访问或以邮递方式，在指定时间内答对一条技能测试的数学问题，方可正式成为得奖者。
The selected entrants must each correctly answer a time-limited, skill testing, mathematical question posed during a pre-arranged telephone interview or by mail.
每位获选之参加者，必须于事先安排的电话访问或以邮递方式，在指定时间内答对一条技能测试的数学问题，方可正式成为得奖者。
The selected entrants must each correctly answer a time-limited, skill testing, mathematical question posed during a pre-arranged telephone interview or by mail.
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