你可能感兴趣的试题
0.02~0.04μm 0.04~0.08μm 0.08~0.16μm 0.16~0.32μm
25%、50%、75% 15%、40%、85% 20%、45%70%
20mmX20mm 25mmX25mm 30mmX7mm 60mmX6mm
80mmx30mm 75mmx25mm 75mmx30mm 80mmx25mm
25mmX5mm 100mmX6mm 125mmX7mm 75mmX7mm
每2.54cm长度上有25个孔 每市寸长度上有25个孔 每厘米长度上有25个孔 每平方厘米面积上有25个孔 每平方毫米上有25个孔
2~3点/(25mm×25mm) 25点/(25mm×25mm) 20点/(25mm×25mm) 12~15点/(25mm×25mm)
6~10个 10~14个 14~20个 20~25个
每市寸长度上有25个孔 每平方厘米面积上有25个孔 每2.54cm长度上有25个孔 每厘米长度上有25个孔 每平方毫米上有25个孔
20mmX20mm 25mmX25mm 30mmX30mm 15mmX15mm
(2~3)点 (5~ (20~25)点 (12~15)点
(6~10)点/(25mm×25mm) (16~18)点/(25mm×25mm) (18~22)点/(25mm×25mm) (20~22)点/(25mm×25mm)