道岔被挤必须后退时,应采取什么措施?
参考答案:
应把尖轨钉固后,再行后退。
From()the information concerning the tons per inch or centimeter immersion of a vessel shall be usually found.
A.variation curve
B.dead weight scale
C.table of azimuth
D.freeboard assignment
在汽轮机组各轴瓦进油口前,装设有不同直径的节流孔板,其作用是什么?