单项选择题
刻度标记的宽度一般以小刻度标记作为基准,其宽度以占刻度间距的()为宜
A.1/4-1/40
B.1/4-1/15
C.1/5-1/20
D.1/5-1/15
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单项选择题
A.1/4-1/40
B.1/4-1/15
C.1/5-1/20
D.1/5-1/15