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【单选题】
一台三相笼型感应电动机，额定电压为380V，定子绕组△接法，直接起动电流为I st ，若将电动机定子绕组改为Y接法，加线电压为220V的对称三相电流直接起动，此时的起动电流为I" st 与I st 相比的变化为______。A.
变小
B.
不变
C.
变大
D.
无法判断
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举一反三
【简答题】选词填空。 take part in look after heard of has been to enjoy yourself 1．Did you ________ ________ on the beach last week? 2．We have never ________ ________ the matter before． 3．Han Li ________...
【简答题】选词填空。 write sell take speak 1.What language _______ in Australia? 2.The nurse in that hospital is very helpful. The children there _______ good care of by them. 3.The colour TV ________ in that shop t...
【简答题】选词填空。 rely on in other words be fed up with take place be likely to pull out in consequence pull through on average go up 1.China's first lunar satellite be launched in Ap...
【简答题】选词填空。 raining, weather, cooking, pretty, sunny 1. Please take the umbrella (雨伞). It's ______. 2. The sun is shining (照耀). It's very ______ today. 3. —Where is your mother, Tom? —She is ______ in the k...
【单选题】以县处级以上领导干部为重点，在全党开展“( )”主题教育，用党的创新理论武装头脑，推动全党更加自觉地为实现新时代党的历史使命不懈奋斗。
A.
不忘初心、牢记使命
B.
两学一做
【简答题】选词填空。 go off take up be reduced by switch over be filled with suffer from take place wake up stand for complain about 1.This program is boring.Can you the TV? 2...
【简答题】选词填空。 worry about, relax, take a big exam, take a long walk, enjoy, lots of, charity, what if, medical research, help with 1. The old man had a million dollars, and he gave it to the _...
【单选题】The little boy enjoys watching cartoons, but I enjoy —— science. A. reading about
A.
diving
B.
skating
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