PLC的输出方式为晶体管型时，它适用于哪种负载（）。A、感性 B、交流 C、直流 D、交直

假如你是一位youth worker，一位名叫Simon的初三学生给你来信倾诉他的烦恼，内容见下表。请据此给他写一封回信，提出针对性的建议（表中建议可供参考），要求不少于80词，信的开头和结尾已给出，不计入总词数。

Problems	1. spend two hours watching TV every day, have no time to do homework well 2. be crazy about computer games, be not interested in outdoor activities and study 3. Parents are angry with him and he felt very sad and hopeless
Advice	1. Understand 2. Watching too much TV and playing computer games are bad for health 3. Choose one hobby and achieve a balance between hobbies and study 4. Take part in some outdoor activities

Dear Simon,
Thank you for your letter. I hope I can offer you some useful advice.
I don’t think it’s wise to spend too much time watching TV and playing computer games.
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I hope my advice will be of some value to you.
Bill Smith