A:had just been dreaming
B:are just dreaming
C:have just been dreaming
D:had just dreamt
运动系统的主要组成部分不包含以下哪个结构( )
(1)log535-2log573+log57-log51.8-5log52.
(2)已知α∈(0,π),sinα+cosα=15,求tanα.