【多选题】【消耗次数：1】
根据IEC（国际电工委员会）规定，低压配电系统按接地方式的不同分为三类，即（ ）。
①
TT系统
②
TN系统
③
IT系统
④
TS系统
⑤
TB系统
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相关题目
【简答题】
系统总线按系统传输信息的不同，可分为哪三类？
【简答题】
按照系统的抽象程度，可将其分为概念系统、[填空1]和物理系统三类。
随机题目
【单选题】
Can you go out with us for dinner this evening?
①
No, I already have plans
②
Thanks a lot but I’m busy tonight
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No, I really don’t like being with you
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I’m ill, so I shouldn’t go out for dinner
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To _________ their new shampoo, they are selling it at half price for a month.
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progress
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proceed
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promote
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propose
【单选题】
I don’t want to talk about it now. I’m not in the __________ .
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feeling
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attitude
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emotion
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mood
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Can I help you with the bag?
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No, no. I can take it myself
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Thank you
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Sorry, you can’t
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No, I’m all right
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The license must be clearly __________ in the car windscreen.
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spread
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displayed
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exposed
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located
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__________ my love of landscape, nothing could persuade me to spend another day in the Highlands.
①
But for
②
For all
③
Above
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Except for
【单选题】
Food was in short __________ ; women stood in line for hours for a bucket of drinking water.
①
store
②
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③
reserve
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supply
【单选题】
His parents __________ him the opportunity to go to university.
①
ignored
②
neglected
③
refused
④
denied