题目内容
输出继电器的线圈只能由PLC内部程序驱动。
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电气控制的器件是硬器件，PLC的编程器件也叫做软继电器。
梯形图编程又叫做继电器梯形图编程。
PLC扫描周期的长短主要是由用户程序决定的。
Complete the sentences, using the words or phrases in brackets. Make additions or changes where necessary. Now choose suitable words from the box to complete the sentences together with the proposition of. sick thoughtful critical guilty ashamed confident conscious fond 1. The man who is _______________ books is usually a man of noble thought. 2. A few years after George settled down in the small town, he became _____________ the same old routine every day. 3. Thank you for calling to see if Amy's ankle is getting better -- it's very ________________________ you. 4. Considering the odds stacked against him, I do not feel ______________________ his chances of success. 5. Let a man become _________________________ what he is and he will soon learn what he should be. 6. When you write a letter of application, you must pay particular attention to punctuation, grammar and spelling, as employers are always ____________________ poor letters. 7. Margaret felt __________________ cheating on the recent test in physics and made up her mind never to let this recur. 8. Jared is _________________________ himself for being so ignorant.
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