生命在于运动

89. At that time I had no idea ________ I could hand it to him without being seen.A. if B. how C. which D. that how为什么选B? D有什么不对? where canyou lie without being scolded 剑桥雅思7test4阅读答案 大学理论力学的动量问题求解? 动量 动能 同一道题用动能守恒和动量守恒求出来的结果不一样,这是为什么? 大学理论力学题,请问答案中的F1到A的力臂为何去l（字母）,而不是别的?谢 the boy slipped out of the room and go swimming中的slip out of the room怎么翻译? Jim was seen () out of the room为什么不是go或going? 求翻译：This is how we become real to ourselves--by being seen by others. it is kept in the room by us 和 it was kept in the room by us 和it is being kept in the room by us具体意思有什么区别啊 这是不是个病句.英语.Whenever and wherever I will be your side forever. 请教初中数学问题,求高手解答12-16题,要有详细步骤哦~ 英语病句查询帮忙找找语病在哪 急 1.They have kept cats in many years.2.The room is very clean now.Who is clean it? 初中数学,第17题,求AF最小值,求过程 下列物质的酸碱性食盐,食盐溶液,碳酸钠,碳酸钠溶液,碳酸氢钠,碳酸氢钠溶液 When i saw you的歌词 物质的酸碱性,探讨1.人体的血液的PH为（）,人的汗液的PH为（）．PH大于（）的盐碱地,草木难生2.PH等于0溶液呈（）性,PH等于（）溶液呈中性． 亲么么是啥意思 么么.. 是不是亲亲的意思? “亲”字的含义是什么?“亲”字有几种含义?现在我发现有很多的女孩子喜欢用“亲”字来向男孩问候.“亲”字到底有几种含义?分别是什么? 是亲亲还是... 亲们,客户这是啥意思啊?亲们,客户这是啥意思啊?Dear Our company is a TRADING since 1987.We are interested and able to import many chemicals for sale to several of our potential customers.This moments we are importing from Europe and 死亡笔记中尼亚是L的弟弟吗? 死亡笔记中尼亚第几集出场 死亡笔记真人版~ 12,13,14,15 生活中各种物质的酸碱性并写出具体的PH值 物质的酸碱性高锰酸钾,色拉油,硫酸铜(晶体)的酸碱性 从示波器的结构说明在实验过程中调零实际是调节了什么,其目的什么? 一单缸汽油机的飞轮每分钟转600周,做功冲程中燃气对活塞的压强为5×10∧5Pa,设压强在此过程中不变,活塞冲程为0.2m,活塞横截面是100cm²,求汽油机的功率. 示波器实验的平均 新民主主义革命的开端的标志性事件分别是什么?