Brazil says its constitution forbids the private ownership of energy assets.巴西称其宪法禁止个人占有能源资产。After the war, a convention was set up to frame a constitution.战后，为制定宪法组织了一次会议。The constitution also confers large powers on Br...
The mass fraction of n - butene in mixed C 4 from catalytic cracking after etherized was approximately 40 %.醚化后的催化裂化混合C4中含有质量分数约为40%的正丁烯,是生产丙烯的优质原料....