A:骨密质的厚度
B:骨内有机物和无机物的含量之比
C:骨髓腔的大小
D:骨松质的排列是否有规律
下列四组水果中,全部产在南方地区的是( )
— Excuse me, have you seen _______ umbrella here?— Yes. Is it _______ beautiful blue one? I saw it here just now.