問題詳情
22.What is the main function of labyrinth packing in a steam turbine engine?
(A)To improve the dynamic balance
(B)To increase the critical speed
(C)To reduce the vibration
(D) To minimize the leakage of working fluid
參考答案
答案：D
難度：適中0.5
統計：A(1),B(2),C(2),D(10),E(0)