胞浆中可以含有中性、嗜酸性和嗜碱性等特异性颗粒的是 （）
A.红细胞系
B.粒细胞系
C.单核细胞系
D.淋巴细胞系
E.巨核细胞系
参考答案：B
By "a system of built-in obsolescence" the author means ______.
A．no formal systems exist in modern industrial society
B．old people have no status in modern industrial society
C．young people have chances in modern industrial society
D．knowledge changes rapidly in modern industrial society
三品一条枪可用于治疗
A．早期宫颈癌B．子宫肌瘤C． * * 炎D．外阴炎E．宫颈结核
