分向量和投影

温度对焊接用气体利用率的影响冬季气温在-15℃~-20℃时,对焊接用的气体利用率影响很大,气体的利用率随温度的变化是如何变化的,该如何提高和改善此情况,请高人指点一二! 稀有气体可以做焊接金属的保护气,是利用了稀有气体的什么? 什么金属导磁效果最好想知道什么金属的导磁效果最好,如果是稀有金属 麻烦提供一些比较得到的导磁效果比较好的金属! 某四冲程汽油机的转速为1200r/min则曲轴1s转动（）转完成（）个工作循环对外做功（）次共经（）冲程 镀铬有哪些应用 四川哪里有卖镀铬棒? 镀铬棒是什么材质 一般镀铬棒的精度是几个丝 mother‘s day is a holiday Mother's day is a___( day/holiday )for all mothers 求舞动精灵的《seven years and fifty days》 的歌词? seven days seven longly night这是一句歌词有谁能帮我找这歌的链接和歌词谢啦! 选择：He spent seven days and nights in the wind and snow,___.A coldly and hungrily B being cold and hungry C cold and hungry adj 和 adv 作状语有什么不同啊?B答案看成是非谓语形式作状语不行吗? She worked （for seven days and seven nights）.对打括号部分提问.________ _________ _________ she _________?每空一词 英语翻译是一分回执里面的 怎么翻译通顺些 please waiting .preparing print 打印机出现故障 不锈钢拉丝水龙头 february 14 is a day for people who have fallen in love.on this day,these men and women give gifts The people on this island___seafoodA live in B live to C live by D live off 求高手帮忙翻译February 14 is a day for people who have fallen in love.On this day,these men and w seven days 谁能帮我翻译一下吗? 太喜欢这首歌了On my way to see my friends who lived a couple blocks away from me (owh) As I walked through the subway it must have been about quarter past three In front of me stood a beautiful ho make room for 和 take room for 到底有没有take room for 这种搭配啊? make room for造句 seven days的中文翻译歌词(Craig David) 对划线部分提问：I watch TV I would like to watch TV.划线提问,划线的是watch TV.____ ____ you ____ ____ ____ ____? L can see a TV(a和TV划线)in Zoom's room.(对划线部分提问）求啊~ we watch TV 划线部分提问 watch tv划线 They say love conquers all,but maybe love never meet Georgina Sparks什么 only people in love believe they were destined to meet.求翻译 Love conquers all什么意思? 这首seven days On my way to see my friends 在我去看朋友的路上 开头歌词是这样的who lived a couple blocks away from me (owh)他们住在离我不远的几个街区外 As I walked through the subway 当我在地下铁里走的时候 i