煤油裂解制乙烯和丙烯。煤油加料量为12t/h，得2700kg/h乙烯和1500kg/h丙烯，乙烯的收率为()%。

已知一干岩样重量为32.0038克，饱和煤油后在煤油中称得重量为22.2946克。饱和煤油的岩样在空气中称得重量为33.8973克，求该岩样的孔隙体积、孔隙度和岩样视密度（煤油的重度为0.8045克/厘米3）。 石脑油裂解制乙烯是石脑油和循环乙烷进（）进行裂解。 〈259>乙烯裂解炉主要功能是把原料油经过加热裂解生成乙烯、丙烯（） The story which moved us a lot happened _____ May 12th, 2008. [ ] 液化石油气、丙烷、丙烯、航空煤油、燃料油、苯、航空煤油、柴油、汽油装车分别来自哪些罐区（并注明单元号）和哪些装车方式？ 液化石油气、丙烷、丙烯、航空煤油、燃料油、苯、航空煤油、柴油、汽油装车分别来自哪些罐区（并注明单元号）和哪些装车方式 已知一干岩样重量为32.0038g，饱和煤油后在煤油中称得重量为22.2946g，饱和煤油的岩样在空气中称得重量为33.8973g，求该岩样的孔隙体积，孔隙度和岩样视密度（煤油重度为0.8045g/cm3） 用作原料,经过高温裂解生产化工所需乙烯、丙烯（） During the 12th five -year plan, China ____ great achievements in environmental protection. DCC的主要产品有丙烯、干气、液化气、汽油、煤油、柴油。（） ________ the afternoon of May 12th, 2008, a serious earthquake (地震) happened in Wenchuan, Sichuan Province. [ ] 用乙烷裂解制乙烯的工艺中，乙烷的进料量为5.4t/h，投入的乙烷有50%转化生成了乙烯，则乙烯的产量为（）t/h。 用乙烷裂解制乙烯的工艺中，乙烷的进料量为5.4t/h，投入的乙烷有50%转化生成了乙烯，则乙烯的产量为（）t/h 评价一种裂解原料的优劣，一要看乙烯、丙烯等目的产物的（），二要看裂解炉的运行（）。乙烯、丙烯等的收率（），炉子运行周期（），则该原料的裂解性能就越好 The Mid-Autumn Day, which is a day for family reunion in China, _____ on September 12th this year. Our school basketball match will be held from October 12th to 16th, during time as many as 30 teams will compete for the championship. People start to prepare for the Spring Festival from the 23rd day of 12th lunar month. The whole Chinese people will never forget the day, May 12th, 2008, _______ the strong earthquake happened in Wenchuan. The representatives were discussing the 12th five-year plan that they would like to see _______ the next year. 煤油（)