单项选择题
A.1 B.2 C.3 D.4
A.5 B.8 C.10 D.20
A.新油:tgδ%≤0.7%(90℃),微量水≤10ppm,总含气量≤1% B.新油:tgδ%≤0.5%(90℃),微量水≤15ppm,总含气量≤1% C.运行中的油:tgδ%≤2%(90℃),微量水≤15ppm,总含气量≤1% D.运行中的油:tgδ%≤4%(90℃),微量水≤20ppm,总含气量≤1%