对于患重症白血病的儿童的治疗方法中，骨髓移植是其中可考虑的方法之一，原因在于骨髓中具有 [ ]
A．红细胞
B．白细胞
C．血小板
D．造血干细胞
D
降低混凝土入仓温度的措施不包括( )。
A．合理安排浇筑时间 B．采用薄层浇筑C．对骨料进行预冷 D．采用加冰或加冰水拌合
No such weapons were used and none been found.
A．none have been
B．none has
C．no other has been
D．no others been
