下列不属于压缩机润滑油系统保养内容的是（）
A.清洗主电动机和风扇电动机
B.油冷却器定期清洗
C.润滑油定期更换
D.润滑油管道的定期清洗
参考答案：A
China's sport delegation consisted of 1,454 members, ________ 977 athletes took part in competitions,
making it the biggest number in the history of China in the Asian Games.[ ]
A. in which
B. in that
C. among that
D. among which
乙脑病毒是通过（）
A.蚊子传播
B.虱子传播
C.跳蚤传播
D.蜜蜂传播
E.苍蝇传播
