题目内容

Why would he want to work as an assistant worker in a hospital for a year or two?In the hospital, he could look andso that he might know what kind of job he wanted to do.

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In choosing a job, what is the first thing to consider?The first thing to consider is how well the jobthe public.

What is the second thing to consider?The second thing to consider is how muchthere is in the job.

What is the third thing to consider?The third thing to consider is thereward in the job.

接通延时定时器的工作原理：当接通延时定时器的输入端S有一个上升沿使其由变为时，定时器开始定时，定时时间到，输出端Q为。当接通延时定时器的复位端R由变为，无论S端为何值，都将清除定时器当前的定时值，输出端Q的信号被复位为。定时器的可以在输出端BI以形式读出，也可以在输出端BCD端以形式读出。