A.≤1.0mm B.≤2.0mm C.≤3.0mm D.≤4mm
A.≥0.2Mpa B.≥0.30Mpa C.≥0.40Mpa D.≥0.50Mpa
A.≥6.0mm B.≥5.5mm C.≥4.5mm D.≥4.0mm