“声音刺耳”反映了声音的 ____很高,“闻其声而知其人”是依据声音的 ____;“余音绕粱三日不绝”是 ____现象.
There isn't in his room.
南方地区房顶坡度大的主要原因是( )
下列不具有社会行为的动物是( )
(已知:2Cu+O2+2H2SO4 =2CuSO4+2H2O;不考虑金、银发生类似反应)