問題詳情
17. The ___________ throttles the liquid refrigerant and maintains the pressure differencebetween the condenser and evaporator.
(A) constant folw control valve
(B) constant pressure control valve
(C) pressure regulating valve
(D) expansion valve
參考答案
答案：D
難度：非常簡單1
統計：A(0),B(0),C(0),D(3),E(0)