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8、实验室制取氯气可以有以下途径,用化学方程式表示如下.若制取等质量的氯气,消耗盐酸最少的是A．8HCl+K2Cr2O72KCl+Cr2O3+4H2O+3Cl2↑B．16HCl+2KMnO42MnCl2+8H2O+2KCl+5Cl2↑C．4HCl+MnO2MnCl2+2H2O+Cl2↑ D．6H 自动灭火系统洒水喷头工作情况在自动喷水灭火系统中（湿式）,当某个喷头收到热作用玻璃泡爆裂后,喷淋泵启动,对管路加压,这时,仅是玻璃泡爆裂的喷头在工作还是局部区域的喷头都会被 消防洒水喷头玻璃球工作液成分?消防洒水喷头玻璃球里面的工作液红色主要成分是什么有谁知道吗?那绿色的呢? 请教消防玻璃洒水喷头技术问题由于消防玻璃洒水喷头屡次做屡次变型,一直找不到技术上的问题.希望有哪为师傅可以请教下.这是我做的消防玻璃洒水喷头样品,定给酬谢我的电话是143960498835 I simply couldn't understand how it ______ that you did so much work with such a short time.A.came about B.came back C.came up D.came along选A.原因? He had _______ much work to do that he couldn't go out.A.so B.such C.as D.or 现在的防空警报声音是为什么? 200个消防喷头需要多大压力 There was so mush noise in the hall that the speaker couldn't make himself_______hearing ,heard,hear,being heard 非谓语动词 There was so much noise outside that the speaker could hardly make ( )A.the audience hear B.the audience hear him C.himself hear D.himself heard 应该选哪个,为什么? There was so much noise that the speaker couldn’t make himself _____.A.hearing B.being heard C.to hear D.heard hear 选哪样一个,为什么? 9.18 上海拉防空警报吗我以为我没听到呢?哎,为什么总怕“友邦惊诧”? 到底拉了吗?这是个原则问题,我在跟朋友打赌. 振动案例分析的例子 声音由振动产生实例 电容滤波是怎么计算的?为什么50Hz常用104? 1 There was so much noise in the room that the speaker could not make himself -----填heard?make 不是动词原形么?2 the ground is-- with --leaves 是covered和 fallen?（为什么是被动语态） 3 lessons -----easily were soon forgotten为什 电源滤波与信号滤波的区别?用通俗点的说法和我讲 There was so much noise that the speaker couldn't make himself [ ](hear). 求问电容滤波是怎么计算的?为什么50Hz常用104? 我想买农业耕作机械,请问在哪个网可以买到 评价我国的农业的主要耕作方式和土地制度? 评价我国的农业的主要耕作方式和徒弟制度? 大自然鱼府怎么样 梅子岭山水鱼怎么样 有关描写山水,湖水中的鱼的诗句有那些? There is so much noise that thespeaker couldn't make himself( )Abeing heard B hearing C heard Dhear 文革结束后,我国的教育事业迅速回到健康发展的轨道,对教育事业发展起关键作用的是A.加强基础教育 B.发展高等教育C.进行教育体制改革和教育立法 D.发展少数民族教育为什么不是C 压延用什么增塑剂一定不会出油?跟环氧值有关系吗 卖鱼桥在登云大桥以南还是以北 公差按 GB/T13914-ST 执行 急 全国.全世界.全宇宙.最老的人有几岁了啊? 全世界对宇宙感兴趣最多的人在那个国家