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某有机物分子量为48,可与金属钠反应放出氢气,该物质与乙酸的反应对研究此类反应有指导意义,求该有机物. 怎么判断有机物是液态还是气态,说是可以看相对分子量, 鸦片战争启示 第二次鸦片战争启示 甲午中日战争启示 八国联军侵华启示 T...不要太长了,要一句话就可以概括那种.是分别的启示. 将Cu片放入0.1mol/L的FeCL3溶液中 反应一定时间后取出Cu片 溶液中c（Fe3+）：c（Fe2+）=2：3 则Cu2+与Fe3+的物质的量之比为_______. 为什么FeCl3溶液与Cu能反应,Cu的金属活动性不是比Fe弱吗 which do you enjoy____your holiday,going abroad or staying at home?选项:A.spending B.to spend C.being spend D.spend为什么不是A呢? when is new year is day When is new year,s day Lt,s_________ AWhen is new year,s day Lt,s_________A in December b on January C in January d on December 选哪个? When is New year is Day?是什么意思 酸碱盐构成的特点 Christmas is a specil holiday. christmas is a western holiday.找错 wp是什么意思 why is christmas a special holiday?用英语 75%百菌清WP中的WP是啥意思? Christmas is coming soon.It is a joyful holiday.译文 魔兽争霸中选手说的wp是啥意思? What happens to the heat given off by the land,water and air?这是我们英语阅读卷上的题目!求答案和翻译! Wp是什么单位, Solar energy,▁time has come ,is very suitable to heat water or make energy.A.what B.whose C,which D.that It _____ a lot of energy to heat water.A.takesB.spendsC.costsD.buys is energy A heat B water C Air water-to-refrigerant heat exchangers 酸、碱、盐到底各是什么粒子构成的?想问问酸、碱、盐的物质到底是由分子构成吗还是由离子构成.我们老师说酸是由分子构成的，而盐和碱是由离子构成的， 酸碱盐溶液里溶质的粒子是离子 可是不是说酸是分子晶体的吗 五氧化二磷的化学符号是什么 五氧化二磷 He returned home in the afternoon of his holiday.改错returned ,home ,of划了线.哪个错了?怎么改啊 I can jog to home in the afternoon.改错 I stayaed at the home yeserday afternoon改错 I returned home early this afternoon改为同义句I returned home early this afternoon改为同义句I ----- ----- home early this afternoon Can you name some famous leaders in the world?完整回答英语