The diverging route of the turnout has to be elevated where it crosses the mainline. To do this, brass channel stock is used to shim up the rail. The diverging route has to be elevated .025″ at the point where it crosses the mainline rail. This is the depth of the flange on an R...
四级英语词汇表1: abandon vt.丢弃;放弃,抛弃 ability n.能力;能耐,本领 abnormal a.不正常的;变态的 aboard ad.在船(车)上;上船 abroad ad.(在)国外;到处 absence n.缺席,不在场;缺乏 absent a.不在场的;缺乏的 absolute a.绝对的;纯粹的 absolutely ad.完全地;绝对地 absorb vt.吸收;使专心 abstract...
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