A.1∕20 B.1∕30 C.1∕40 D.1∕50
A.莫氏2號(hào) B.莫氏3號(hào) C.莫氏4號(hào) D.莫氏5號(hào)
A.0.1~0.2B.0.25~0.35C.0.4~0.5D.0.6~0.7