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.R " is a replaceable function , e . g . acetoxy, methoxy, their acyloxy and alkoxy homologs or halo.通过选择特定的同系物混合物, 可以达到应用性能的优化.By selection of specific homologous mixtures, application ...
Rotary's primary responsibilities include fundraising, advocacy, and volunteer recruitment.扶轮主要的责任包括了募款 、 倡导和招募义工.Active & negative factor of indebted management, and keeping away of fundraising risk.负债经营对企业的积极 和 消极...
The alchemists were the forerunners of the scientists of today.炼金术士是今日科学家的先驱.Medieval alchemists attempted to transmute base metals into gold.中世纪的炼丹术士企图把贱金属炼成金.The alchemists were unable to accept the inconvertible natur...
From somewhere distant he heard the clatter of a typewriter.他听见从远处什么地方传来打字机的嗒嗒声。I found her a rather austere, distant, somewhat cold person.我发现她相当严厉，拒人于千里之外，近乎冷漠。The rolls of distant thunder were growing more ominous.远处隆...