問題詳情
52 Standpipe systems have been installed in health care facilities for many years to provide______ valves inenclosed stairs and throughout selected occupied rooms and corridors.
(A)hose
(B)duct
(C)coil
(D)water
參考答案
答案：A
難度：非常困難0.192308
統計：A(5),B(5),C(6),D(7),E(0)