I-shaped cross section connecting rods are made of carbon steel.
工字型截面连接杆件是由碳制成。
By this time, a subtle wedge-shaped cross-section had been selected.
由这个时候，一个微妙的楔形截面已选定。
Generally for metal circle rod-shaped, each section may have the different diameter.
一般为金属圆杆状，各段可以有不同的直径。
Generally for metal circle rod-shaped, each section may have the different diameter.
一般为金属圆杆状，各段可以有不同的直径。
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