各种血细胞均起源于骨髓中的（）.
A.成纤维细胞
B.髓系干细胞
C.淋巴系干细胞
D.基质细胞
E.多能造血干细胞
参考答案：E
A: 1 , where is the nearest police station, please?
B: I’m sorry , I don’t know. 2 .
A: 3 . Excuse me, where is the police station, please?
C: It’s over there. 4
A: Thank you very much.
C: 5 .
大宗散装进口货物的鉴重及合同规定凭卸货口岸检验检疫机构的品质、重量检验证书作为计算价格、结算货款的货物，应向口岸或到达检验检疫机构报检。( )
