石脑油馏份与一个热表面接角，就裂解而得到乙烯和丙烯。
In contact with a hot surface, naphtha petroleum fractions crack to produce ethylene and propylene.
这些包括在聚碳酸酯和幕墙之间流线转换的细部设计，比如在双框架结构处避免连接楼板和使用斜接的角面板。
These include the streamlining of transition details between Polycarbonate and curtain wall, the avoidance of double-frame joints at floor slabs and the use of mitered corner panels.
在拆三角接盘时，应在连接处打一记号，以便安装时按记号装复。
Pick in the demolition of triangular plate , the junction should be a mark for installation by sign refitted.
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