A.均勻 B.不均勻 C.無(wú)規(guī)律 D.一大一小規(guī)律
A.≥1.2mm B.≥1.4mm C.≥1.6mm D.≥1.8mm
A.0.2~0.3mm B.0.3~0.5mm C.0.2~0.6mm D.0.6~1mm