This large fireplace can produce 45, 000 BTU adjustable heat.这款大型壁炉可产生45, 000btu的可调节热量.He is already the general engineer of this low BTU water gas project.他已经是这个低热水煤气工程的总工程师了....
用 4- 氨基安替比林与 3- 甲酰基色酮 、 肉桂醛、茴香醛反应分别合成了3种新的席夫碱化合物.Three novel Schiff bases were synthesized using the reaction of 4 - aminoatipyrine with 3 - formylchromone, cinnamaldehyde and anisaldehyde.从茴香油生产茴香醛的废渣、废液中提取副产品茴香酸,合成茴香酸甲...