單項(xiàng)選擇題
A.1 B.2 C.3 D.4
A.4 B.3 C.2 D.1
A.2 B.3 C.5 D.10
A.±30″ B.±20″ C.±10″ D.±5″
A.±50 B.±40 C.±30 D.±20
A.30 B.40 C.50 D.70
A.1/500或1/1000 B.1/1000或1/2000 C.1/2000或1/5000 D.1/200或1/500