单项选择题
A.10-30min B.20-30min C.10-40min D.20-40min
A.2-3cm B.3-4cm C.2-5cm D.3-5cm
A.0.1Mpa B.0.2Mpa C.0.3MPa D.0.4Mpa
A.1.5∶2.5 B.1.0∶2.5 C.0.5∶1.0 D.0.5∶3.0
微信扫一扫,加关注免费搜题
