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。
The cross-section of connecting tube in fan room designed to square cross section is better.
风机房连接风道断面型式采用方形效果较好。
The cross-section of connecting tube in fan room designed to square cross section is better.
风机房连接风道断面型式采用方形效果较好。
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