油重均为2500kg以上的屋外油浸式变压器之间无防火墙时63kV最小防火净距为()。
A. 4m
B. 5m
C. 6m
D. 8m
A man was sighted as he fell overboard. After completing a Williamson turn,the man is not sighted. What type of search should be conducted?()
A. Expanding circle
B. Sector search
C. Parallel track pattern
Datum-drift search
浮选捕收剂的亲固基团的键合原子有哪些?其与矿物表面的吸附遵循什么原则?
Teaching materials should agree with or reflect the teaching(),aims, objectives and teaching methods.