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 ...
More than 5,900 units above the regimental level were dispersed through dismantling , merging, demoting or reforming.全军经过撤销 、 合并 、 降级、改制,共减少团级以上单位5900多个.He ordered the dismantling of police checkpoints on highways, which...
Today many radioisotopes are produced using the particle accelerator called a cyclotron.今天许多放射性同位素是用被称为回旋加速器的粒子加速器来制造的.The cyclotron frequency can also be derived by an elementary argument.回转频率也可以通过浅显的论证导出来.How well is t...
Who can deny his stature as the world's greatest cellist?谁能否认他是世界上最伟大的大提琴演奏家呢？The cellist's bowing was very sensitive .那位大提琴手的弓法十分细腻。World - renowned cellist Yo - Yo Ma founded The Silk Road Project in 1998.世界闻...