单项选择题
A.1/1000 B.1/100 C.1/10 D.1/10000
A.0.7 B.0.4 C.0.9 D.0.8
A.4/100 B.5/1000 C.2/1000 D.3/1000
A.调速阀 B.溢流阀 C.单向阀 D.换向阀
微信扫一扫,加关注免费搜题