A.2 B.3 C.4 D.5
A.(0.1~0.3)軸頸直徑 B.(0.01~0.03)軸頸直徑 C.(0.001~0.003)軸頸直徑 D.(0.0001~0.0003)軸頸直徑
A.1 B.2 C.3 D.4