单项选择题
A.YJ29B.YJ27C.YJ212D.GD121
A.50Pa (2inH2O)B.100Pa(2inH2O)C.150Pa(2inH2O)D.500Pa(2inH2O)
A.YJ27型接装机B.YJ29A型接装机C.YJ212型接装机D.AF12型接装机