单项选择题
A.500mm B.520mm C.540mm D.560mm
A.5~13MPa B.5~7MPa C.7~8MPa D.8~10MPa
A.阀座接头 B.中心管 C.堵塞器 D.水嘴
A.18mm B.20mm C.22mm D.24mm
微信扫一扫,加关注免费搜题