来个由简到难的,看能造句造到26楼么? 这个从a到y: a s a v ery k ind scientist , i c an n ot o nly d o e verything f or m y research g ladly , but also protect animals in the y ard from x -rays which q uitely need h elp w ith p leasure, with t he u nique hope that every animal can l ead a r ather s imple but j oyful life 查看更多
泵配套电机为什么要装加热器,什么情况下工作? 原帖由 cqfblue 于 2009-1-9 21:19 发表 anti-condensation heaters all motors in excess of 5 kw shall be provided with heating devices to prevent condensation during periods of idleness. heaters shall be of a fully insulated design, lon ... 请问一下上边这段话引用的是什么文献?请告知明确出处。 谢谢查看更多