工字型截面连接杆件是由碳制成。

I-shaped cross section connecting rods are made of carbon steel.

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连接杆件的管状连接，其最小长度应该是其外径的两倍。

The tubular connection of the frame components to be fitted together shall have a minimum length of two times the outside diameter.

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离合器是位于发动机和变速器之间的一个旋转装置，它包括飞轮，离合器摩擦片，压盘。压紧弹簧。离合器盖以及操作离合器所需要的连接杆件等。

The clutch which includes the flywheel, clutch disc, pressure plate, springs, cover and the linkage necessary to operate the clutch is a rotating mechanism between the engine and transmission.

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