單項選擇題
A.3B.5C.6D.10
A.3 B.5 C.6 D.10
A.5 B.6 C.10 D.50
A.2 B.3 C.4 D.5
A.3 B.4 C.5 D.6
A.1/500或1/1000 B.1/1000或1/2000 C.1/2000或1/5000 D.1/500或1/10000
A.1 B.2 C.3 D.5