A.0.002 B.0.003 C.≤0.001 D.≤0.01
A.≤0.001 B.≤0.01 C.≤0.005 D.≤0.002
A.中凹形狀 B.中凸?fàn)?br /> C.凹凸不平狀 D.任意形狀