| Message: | Aluminium alloy high temperature quenching and forging has good anti-rust, anti-corrosion, abrasion resistance, bending resistance, strong and durable
The tangent value of the rafter conversion angle that is common in the English scale is used to multiply the 2 angle to draw the slope line. The roof rafters are chamfered and the tangent value will be used when opening the bird's beak = some-the sharp edge is adjacent to the other-- Ratio of right-angle sides url:http://www.cahandtools.com |
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