Q分类通常要求客体数目在()。
参考答案:60-120
常累及中纵隔的疾病有()
A.结节病
B.Castleman病
C.支气管囊肿
D.胸腺瘤
E.淋巴瘤
The invention of artificial hearts marked a turning point in the battle ________ heart disease.[ ]
A. among
B. for
C. against
D. between