An environmental friendly phosphorus - free degreaser is obtained by orthogonal test.通过正交试验得到一种以表面活性剂为主、辅以助剂的环保无磷脱脂剂.Remove oil and grease, etc. with a suitable detergent or degreaser.用适当的清洁剂和脱脂剂除去油脂.This machine is main...
Police with riot gear and several fire engines are in attendance.防暴警察和数辆消防车都到了。He lived in considerable style, travelling widely, usually with a cook, valet, butler and chauffeur in attendance.他活得相当潇洒，通常带着厨师、用人、管家和司机到处游玩...