A.t<17mm的允許偏差是±1.0mm B.t<17mm的允許偏差是±1.5mm C.17≤L<22mm的允許偏差是±2.0mm D.t≥22mm的允許偏差是±2.0mm
A.L<1000mm的允許偏差是±1mm B.L<1000mm的允許偏差是±2mm C.1000≤L<2000mm的允許偏差是±2 D.L≥2000mm的允許偏差是±3mm
A.L<1000mm的允許偏差是±1mm B.L<1000mm的允許偏差是±2mm C.1000≤L<2000mm的允許偏差是+2,-3 D.L≥2000mm的允許偏差是±3mm