A.≤1.2m,≥30mm,≤150mm B.≤1.2m,≥30mm,≥150mm C.≥1.2m,≤30mm,≤150mm D.≥1.2m,≥30mm,≤150mm
A.等于或小于10mm B.等于或大于10mm C.等于或小于15mm D.等于或大于15mm
A.1/5 B.1/4 C.1/3 D.1/2