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1500米跑步规则校运会要跑1500（男）,之前没跑过,不懂规则,求指教.是不是第一圈在自己的道跑?从第二圈开始就可以插入第一道?有哪些行为是犯规的? 我在儿子的卧室里安装了一面镜子,有人告诉我卧室装镜子不好.请问为什么? 卧室里有两面镜子都是落地,相对的,两张床,有一张床还对着外屋一面镜子,把门关上又对着门…怎么调整啊 已知x²-3x=14,求(x-1)(2x-1)-(x+1)²-2（2-x)的值 为什么化学反应前后,酶的化学性质和数量不变,但老师又说酶完成相应反应后被灭活,这两者有点矛盾呀,请高人指教. 英语试卷 固定化酶是否比游离状态酶更方便研究其化学性质?仅是方便半衰期研究吗? no decision ____about any futher appointment until all the candidates have been interviewedA. will be made B. is made C. is being made D. had been made为什么用A 我觉得从句不是用完成时吗 那应该是对现在产生影响猜对啊. No decision ( ) about any future appointment until all the candidates have been interviewed.A.will be madeB.is made为什么选B而选A No decision ( ) about any future appointment until all the candidates have been interviewed.A.will be madeB.is madeC.is being madeD.has been made No decision about any future appointment until all the candidates have been interviewed.A.will be made B.is made C.is being made D.has been made Thanks,may be it is true ．I will remember your words. but, who are you 汉语是什么 DAVID HELPS HIS MOTHER WITH HER HOUSEWORK EVEY SATURDAY FOR ABOUT __.A:ONE AND HALF HOURSB:A HALF AND AN HOUR C:AN HOUR AND A HALF D:ONE AND A HALF HOURS Begin Again 什么意思 大学谈恋爱的好处英文 begin again after a 用英语回答大学拍拖的好处 begin again含义 有什么意义?今天惹女朋友生气了·· 她发说说就begin again两个单词,有啥具体含义没? I will begin Begin again!Come on! dale ofen helps his mother with housework d（ ）the weekands 括号里填什么 如何处理朋友间的利益关系更妥当 susan was at the peak of her sports什么when she injured herself have to的意思是什么? have to与have got to在意思上有什么区别吗 suggest to 4-2的x-1次方＞0怎么解这样的方程 낡은 사랑什么意思 i have 什么意思 사랑은 @ 작은 저녁 jim and sam are coming in a week对in a week提问 ----- -----are jim and sam coming? Ben and Mike are in the library.对Ben and Mike提问,是Who are in the library?Ben and Mike are in the library.对Ben and Mike提问,是Who are in the library?还是Who are in the library?