問題詳情
5. Certain watch keeping duties are necessary for the continuous operation of equipment or
plan such as the ________.
(A) purifying oil
(B) transferring oil
(C) supplying fuel from rank to engine
(D) heating heavy oil
參考答案
答案：B
統計：A:27,B:139,C:90,D:33,E:0
難度：困難