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如图所示,一轻质弹簧竖直固定于地面上,弹簧上端连接一质量为m的重物,静止时弹簧压缩量为d,现给重物施加一竖直向下的力,使弹簧的压缩量为4d,稳定后撤去外力．已知重物通过原平衡位置时 LED电阻限流时,由于温度过高,贴片电阻易融锡.是低温锡膏.有什么解决办法吗? 贴片电阻电容分有铅无铅吗 SMT一个0603的贴片电阻需要多少克锡膏? 一根铁丝,剪去四分之一还剩四分之一,这根铁丝长多少米?1/4X+120+（1/4X+120）＝X这个方程咋解？ 1.Who will come the______(家长)meeting?2.We can see flowers all______(到处).3.The first floor in American English means the______floor in British English.4.“_______me your ticket,please.”The conductor(检票员)said.5.Do you have the habit of The questionb will probaly _______at the meeting A be come up B come up 火线、零线带电,电器不能使用,不是零线断路不知道电线线路什么问题致使整个房间电器突然不能使用,在所有的用电器都拔下及开关都关闭的情况下,零线火线同时带电.但插上电器却无法使 The question will probably____at the meeting. A.raise B.be come up C.come up D.come up withThe question will probably____at the meeting.A.raiseB.be come upC.come upD.come up with 零线断路后,氖管依然发光,此时火线,零线中有电流吗 碧空如洗、黄沙满天、波涛起伏、狂风怒号、百折不回连成一段话 碧空如洗、黄沙满天、波涛起伏、狂风怒号、百折不回连成一句话 接电线时不用焊锡膏可以吗,那样慢,还有焊锡膏会腐蚀手吗 明矾溶液和氢氧化钡明矾溶液中逐滴加入氢氧化钡溶液反应方程式及图像 He had a very wonderful time in Japan,_____he could always remember in his life.A.one B.that C.what D.where谁能解释一下为什么选A呢? I don't know whether he _____(drops/will drop)by tomorrow. 谁知道对金钱的淡然描述的句子 写一段话（3句话以上）,用遥望、晶莹、资源、矿物、恩赐、节制、枯竭,写一段话.（3句话以上）用和蔼可亲、闪闪发光、风雨同舟,写一段话.（3句话以上）用一命呜呼、苟延残喘、罪魁祸 The film isn't true to life ,but it's very exciting ,and some of it is very funny.后面的“some of it is very funny"中,为什么是”some of it is very funny " 而不是are very funny The film is true___daily life;it's very interesting.A.with B.on C.to D.in 给出理由 请问充电器是输入100-240V,50/60Hz,0.15A的用电器能否用0.2A的进行充电?三星的充电器输入：100-240V 50-60Hz 0.15A 输出：5.0V-0.7ALG的充电器输入：100-240V 50-60Hz 0.2A 输出：5.0V-0.5A这两个充电器插头能否 The______that the new rule be adopted came from the chairman.A.ideaB.thoughtC.suggestionD.report回答并说明为什么. ________ down what the expert will say at the meeting,will you?Which of the following is not righA.Put B.Set C.Write D.Take都有记下的意思吧?哪个对呢Which of the following is not right?选不正确的一项。四个+down都有记下的意 ..酸性溶液,中性溶液和碱性溶液在组成上各有什麼特点?THZ 搞不懂的英语题目______ there is a good deal of truth in this idea.A.as a matter of fact B.in the eventC.it would seemD.surprisingly enough 有个英语问题一直搞不懂请先回答以下两个问题how did you like it?“你是如何喜欢上它的？”又该如何翻译 《阿Q正传》的Q的读音是什么? 阿Q正传的Q什么意思 《阿Q正传》里的Q是什么意思? 输入100～240V 50- 60hz 7w 输出DC-12V 0.能不能用在输出9Vdc==0.6A的充电器代替输入100～240V 50- 60hz 7w 输出DC-12V 0.能不能用在输入100-240v-50-60hz 0.3a输出9Vdc==0.6A的充电器代替那个大虾指教额 请问Once u leave,the feeling will stay or leave? Will you stay or leave?