很多運(yùn)河是按照地圖上的坐標(biāo)線開(kāi)鑿的。Many canals were built along map grid lines.介紹了熱熔型道路標(biāo)線涂料的組成及其施工方法.Composition and application of thermoplastic marking paint are introduced.初學(xué)游泳者不得進(jìn)入深水區(qū),攜帶救生圈不得超越淺水區(qū)標(biāo)線進(jìn)入深水區(qū).Beginners or swimmers wearing...