問題詳情
51 One of the most important items of personal protective equipment used by firefighters and rescue personal is“self-___________t breathing apparatus,” which ensures the automatic and sufficient breathing of the firefighter staffmember.
(A)contained
(B)maintained
(C)sustained
(D)extended
參考答案
答案：A
難度：困難0.307692
統計：A(12),B(11),C(11),D(2),E(0)