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如图,E是AB上的一点,（1） 已知∠DEC=∠ADE,可以判定哪两条直线平行为什么?（2）已知∠AEC+∠DCE=180度（3）已知∠AED=∠B,可以判定哪两条直线平行?为什么? 双因素理论的基本内容是什么?在现实管理实践中如何运用这种理论?哪位高手帮帮我吧!在下表示感谢 简述双因素理论的基本观点. I never been there before=I haven't been there before? Some students haven't been there I never been there before.--Translate to MandarinI have never been there before=I haven't been there before? Is this sentence correct?1）I never been there before=我从没到过那里.2）I haven't been there before?=我从没到过那里.I have ju 地球绕太阳转一圈大约是几年? 植物名称和植物生长地点校园植物记录表 校园动物记录表 植物名称 生长地点 动物名称 经常活动的地方 1 2 3 4 5 6 7 8 9 10 11 不是校园的也行 My Trip PlanI went to ( ).It is ( )there.I am doing to go there with ( ) .We are going to go there by( ).I`m going to ( ),( ).I`m going to take ( ),( )with me.It will be fun.I can have a good trip. 英语作文：my trip plan my trip plan寒假的英语作文I want to go to____.It is______there.I am going to go there with_____.We are going to go there by______.I'm going to______________________.I'm going to take________________________________with me.It will be fun.We wil She talks as if she had been there before是什么从句 I had been there before我去过那 这么说对吗 the house looked stangely familiar to her,though she knew she'd never been there before请问这句话的意思,并分析其结构, there,Lisa,speak,before,can,been,because,has,she,French 陈述句 连词成句 在这大好的春光中,人们把希望的种子撒到了地里,播种下下一年的希望 改病句 三月的瘦西湖盘是春暖花开的时节 病句怎么错了啊? 为什么说我们的汉字即使有那么多形声字,也不妨碍它属于表意文字体系 为什么说我们汉字即使那么多形声字,也不妨碍它属于表意文字体系? 西藏生长在冰雪中的植物是什么 海水中哪些元素对植物生长有害呀? 初一英语作文：My school trip 60词z y要有过去式,急,求各位大神zhi di an 假如地球只公转、不自传,还会有昼夜交替吗? 有没有什么典故? 请告诉我沧海桑田的典故,说明了什么道理? 沧海桑田典故 “沧海桑田”出自何处典故 如地球只有自传没有公转会怎么样? 如果地球停止自传,世界将会怎样? 月亮旁边那个最亮的星星叫什么名字? 11月19日晚上9点,在月亮旁边最亮的那颗星星叫什么 Don't forget to come to dinnerA,Idon't B Iwon't C.I can't D.I may not