A:氯气
B:溴水
C:NaOH溶液
D:酸性KMnO4溶液
“庄稼一枝花,全靠肥当家”。下列对这句农谚的理解,不正确的是( )
一条直线上有四个点A、B、C、D,且线段AB=18cm,BC=8cm,点D为AC的中点,则线段AD的长是( )
人体的消化系统由____和____组成.
— Where is Mr. Green, do you know? I have something to tell him.
— He to Hong Kong for a meeting. He home three days ago.