问题
问答题 简答题
阴离子交换器的大正洗时间过长，模拟操作如何处理？
答案
参考答案：
阴离子交换器大正洗时间过长的主要原因，是再生中有乱层现象，或加碱量不足。这时，需重新再生。首先进行小反洗，进行大反洗，关反洗进水阀和反洗除水阀，静置5分钟，开始进碱再生，重新再生的加碱量只需正常加碱量的50％即可。
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阴离子交换器的大正洗时间过长，模拟操作如何处理？
参考答案：
阴离子交换器大正洗时间过长的主要原因，是再生中有乱层现象，或加碱量不足。这时，需重新再生。首先进行小反洗，进行大反洗，关反洗进水阀和反洗除水阀，静置5分钟，开始进碱再生，重新再生的加碱量只需正常加碱量的50％即可。
阅读短文，然后根据其内容，从短文后的五个选项中选出能填入空白处的最佳选项（有一项为多余选项）。 Shopping is popular with many people around the world. They seem to find new ways to buy things every day. They visit shopping centers, order things through the mail, or buy things on the Internet. 小题1: For young people, one of the most popular ways to shop is to use a vending machine (自动售货机). These machines offer all kinds of things and you can find them everywhere. In the USA, there are vending machines which sell CDs. 小题2: The strangest product on sale from a vending machine is in Japan. Just put your coins in the vending machine Tokyo, press the button, and out comes a “kabutomushi”，that is, a black beetle（甲壳虫). You keep it as a pet! Japan now has “Robosho”—a shop with no shop assistants, only robots. A robot reads your credit card(信用卡)and then gives you what you what.小题3: People are very surprised that the robots can serve them as well as shop assistants do. Some shops in the UK are like social clubs for teenagers. Many of them have a café inside. The Youth Station has a large nightclub for teenagers under 18, with a DJ playing music in a room that hangs the ceiling. Sports Town has a big screen, where you can see live sports from around the world. 小题4:
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