A:The man is blind but he is a cheerful person.
B:The man is deaf but he is a successful person.
C:The man is blind but he is a cheerful man.
免疫细胞是指( )
如图所示是长江沿江地带,它在“H”型格局中起什么作用?( )
如图,身高为1.6m的小明想测量一下操场边大树的高度,他沿着树影BA由B到A走去,当走到C点时,他的影子顶端正好与树的影子顶端重合,测得BC=1.4m,CA=0.7m,于是得出树的高度为( )