Using benzene as internal standard, the calibration factors of derivative of aldehydes 2,4 - dinitrophenylhydrazine ( DNPH ) were measured.将醛类物质与2, 4- 二硝基苯肼 ( DNPH ) 的衍生反应液直接进样,以苯为内标物,测定了甲醛 、 乙醛等醛类物质DNPH衍生物的校正因子....
地堑成为铀矿沉积的有利部位.A graben creates a favourable setting for uranium deposition.这些矿体与沉积的主要方向一致.These deposits parallel to the main direction of sedimentation.三角洲分流中沉积的河流砂是石英质的.Fluviatile sands deposited by delta distributarie...
They say hydrogen peroxide or carbamide peroxide may also help.他们还认为过氧化氢和过氧尿素也有所帮助.They say hydrogen peroxid peroxide or carbamide peroxide may also help.同时,过氧化氢或者过氧化脲也可以起到辅助的作用.They say hydrogen paroxide peroxide or car...
音乐停止，灯光亮起。The music stopped and the lights were turned up.屋子里唯一的光亮来自炉火。The only illumination in the room came from the fire.为了宴会,这些银器需要擦得光亮.The silver will need to be polished up for the dinner party....
"Will Joe be here at Christmas?" — "I expect so."“圣诞节时乔会来这里吗？”——“我想会的。”Joe had a low, guttural voice with a mid-Western accent.乔说话声音低沉粗嘎，带着中西部地区的腔调。Joe forced a smile, but underneath he was a little disturbed.乔强颜欢笑，但内心里感...