Daniel's few encounters with Gold had been characterized by a laboured politeness.丹尼尔与戈尔德的几次碰面都只是虚礼客套一番。Encounters of like charges act to diminish the coagulation rate.同性带电粒子间的碰撞作用减少凝聚率.She had heard of these encoun...
It was prepared by the reaction of 12 H - dibenzo [ d , g ] [ 1,3 ] dioxocin - 6 - carboxylic acid with acetoxime.由二苯并-1,3-二氧杂 - 环辛烷 -2- 羧酸经两步反应制得, 总收率70%....