I want a pair of wrist protectors and two pairs of kneepad.我要一副护腕和两副护膝.The user must put on the helmet, palm and elbow and kneepad.使用者比须穿带安全帽, 护掌护肘护膝....
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....
供水以及其他公用事业受到了严重影响。Water supplies and other public utilities were badly affected.曾为水井供水的蓄水层正式宣告干涸了。The aquifer which had once fed the wells was pronounced dry.州水利工程项目已切断了对农场主的所有供水。The State Water Project has shut off all ...