皮皮学，免费搜题
登录
搜题
【简答题】
（8分）阅读下列材料后，回答相应问题。 一个体重50Kg的健康人，含铁2g。这2g铁在人体中不是以单质金属的形式存在的，而是以Fe 2+ 和Fe 3+ 的形式存在。二价铁离子易被吸收，给贫血者补充，应给予含二价铁离子的二价铁盐，如硫酸亚铁（FeSO 4 ）。服用维生素C，可使食物中的三价铁离子还原成二价铁离子，有利与铁的吸收。 （1）人体中经常进行 的转化，A中Fe 2+ 做 剂，B中Fe 3+ 做 剂。 （2） “服用维生素C，可使食物中的三价铁离子还原成二价铁离子。”这句话指出维生素C在这一反应中做 剂，具有 性。
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】Currently， the two women________. 查看材料
A.
are married again
B.
frequently visit each other
C.
live in different places
D.
live together
【单选题】中继器、以太网交换机、路由器分别工作在OSI模型的哪位层次上？（）
A.
物理层、链路层、网络层
B.
物理层、网络层、链路层
C.
物理层、链路层、传输层
D.
链路层、链路层、网络层
【简答题】What are the two researchers studying currently?A. How to deal with work stress. B. How to improve work performance. C. Which
factor is most important to happiness at work. D. Whether the seven factor...
【单选题】What are the two researchers studying currently?
A.
How to deal with work stress.
B.
How to improve work performance.
C.
Which factor is most important to happiness at work.
D.
Whether the seven factors also make other types of workers happy.
【单选题】Currently, the two ccompanies _____ a price war.
A.
engage to
B.
engage in
C.
are engaged to
D.
are engaged in
【单选题】Currently, the two companies a price war.
A.
engage to
B.
engaged in
C.
are engaged to
D.
are engaged in
相关题目：