单项选择题
A.10mm B.25mm C.20~30mm D.20mm
A.1:2~1:3 B.1:2~2:3 C.1:3 D.2:3
A.1:0.75~1:1.00 B.1:1.50或更缓 C.1:1.00~1:1.25 D.1:1.25~1:1.50
A.1:0.75~1:1.00 B.1:0.50~1:0.75 C.1:0.30~1:0.75 D.1:0.30~1:0.50
微信扫一扫,加关注免费搜题