所加的反应物可以是二烯烃 、 环二烯烃.The feed reactants can be alkadienes, cycloalkadienes.包含两个双键的化合物叫做二烯烃.Compounds containing two double bonds are called dienes.与二烯烃橡胶相比, EPDM的双键很少.Compared with diolefine rubber, EPDM has less double b...
Hence enacted law is more authoritative and more integrative than judge - made law.因此,制定法比法官造法更具有权威性和统一性.A new viewpoint of chemical - and - plant integrative fixation is put forward.提出了开展化学 - 生物一体化固沙新观点.The class of sin...
Alas, it's not that simple.哎呀，事情不是那么简单的。Credit, like a looking-glass, broken once, is gone, alas!信誉像镜子，破碎无法补。Such farsightedness is, alas , only a drop in the bucket.可惜,这些远见只是杯水车薪.Long ago I had a heart, and sighed ...