In the following conversation, B violates the maxim of________ .
X: Who was that you were with last night
Y: Did you know that you were wearing odd socks.
某地区居民,长期以玉米为主食,常有人患有口疮、舌炎、皮炎、周围性神经炎,伴有腹泻。该地饮食可能缺乏的维生素是( )
维生素B₁
维生素B₂
维生素C
维生素A
维生素D
In the following conversation, B violates the maxim of________ .
X: Who was that you were with last night
Y: Did you know that you were wearing odd socks.
以下关于所得税费用的说法中正确的是( )。
关于机械排烟系统设计的说法,正确的是( )。