应告知生产调度需要多少这种垫圈.Production control needs to be informed how many such washers will be needed.何芬换好了垫圈,把马儿赶动身, 又动手干活.Hooven, the washer replaced , turned to his work again, starting up the horse.防雾, 防紫外线,防碎的聚碳酸酯镜片, 硅胶镜带及垫圈...
观测开始之前的一项主要工作是认真选点.Careful reconnaissance is essential before observations begin.论述了用支撑柱加固无梁板的选点原则.The principle for choosing supporting points for strengthening flat - slab Was discussed.凡是由几个任意选点确定的球面都是同心面.The spherica...