以非质子酸氯化亚锡为催化剂,催化合成了丁醛-1,2-丙二醇缩醛.Butyraldehyde 1,2 proparediol acetal was synthesized by using stannous chloride as catalyst.以非质子酸氯化亚锡为催化剂,催化合成了丁醛-1,2-丙二醇缩醛.Butyraldehyde 1,2 propanediol acetal was synthesized by using st...
这艘船上的船员现在都已精疲力竭，彻底丧失了信心。The ship's crew were now exhausted and utterly demoralized.船上的工作人员除了面包什么也不给他们吃。The crew of the ship gave them nothing but bread to eat.飞船上的6名宇航员将在太空度过10天。The six astronauts on board will spen...
...replaceable butane gas cartridges.可替换丁烷气贮气瓶R " is a replaceable function , e . g . acetoxy, methoxy, their acyloxy and alkoxy homologs or halo.R ” 是取化基,如乙氧基 、 甲氧基及它们的环氧和烷氧同系物或卤基.Phenolic Backed Seat: Non - collapsible...