【判断题】
A、长约50mm,锥度为1:20,大端比管孔大0.025~0.05mm B、长约40mm,锥度为1:25,大端比管孔大0.025~0.05mm C、长约40mm,锥度为1:20,大端比管孔大0.025~0.05mm D、长约50mm,锥度为1:25,大端比管孔大0.025~0.05mm
A、长约50mm,锥度为1:20,大端比管孔大0.025~0.05mm B、长约40mm,锥度为1:25,大端比管孔大0.025~0.05mm C、长约40mm,锥度为1:20,大端比管孔大0.025~0.05mm D、长约50mm,锥度为1:25,大端比管孔大0.025~0.05mm
A、0.5mm;0.5mm;0.01mm B、0.05mm;0.05mm;0.001mm C、0.01mm;0.01mm;0.05mm D、0.05mm;0.05mm;0.1mm