下列物质中非造血的成分是()
A.铁
B.钙
C.叶酸
D.维生素B12
E.珠蛋白
参考答案:B
Last weekend, Linda had a very exciting _____.She went to have fun with her friends in Disneyland.
A. news B. information C. experience
系统性红斑狼疮可能的发病因素,应除外
A.T细胞活动亢进
B.性别因素
C.体内有多种自身抗体形成
D.B细胞活动亢进