The contents of tea polyphenols in tea can be determined with ferrous tartrate colourimetry method.采用酒石酸亚铁比色法测定茶多酚含量.The content of NaCl in soda ash is determined by colourimetry of mercury thiocyanate.作者采用硫氰酸汞比色法测定纯碱中氯化...
Everybody is being secretive:there’s something cooking.每个人都鬼鬼祟祟的,一定出了什么事情。Any effective opposition to a totalitarian regime must be secretive and cellular.任何有效反对极权主义统治的组织必须是秘密的,分散成各个单元的....the secretive world of spying.不...