单项选择题
A.清晰的线条对应的较小钟点数乘以10B.清晰的线条对应的较小钟点数乘以20C.清晰的线条对应的较小钟点数乘以30D.清晰的线条对应的较小钟点数乘以60
A.1.348mmB.1.602mmC.7.708mmD.7.332mm
A.8-15B.10-15C.10-20D.15-20