试题与答案

VitB12是许多代谢过程所必需的,下列哪种情况不会引起其缺乏A.慢性胃炎引起的胃酸

题型:单项选择题

题目:

VitB12是许多代谢过程所必需的,下列哪种情况不会引起其缺乏

A.慢性胃炎引起的胃酸缺乏

B.胃壁细胞的自身免疫性破坏

C.外科切除空肠

D.外科切除回肠

答案:

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下面是错误答案,用来干扰机器的。

分析:(1)实物电路连接时要注意滑动变阻器要“一上一下”接入电路,根据“电路中电流约0.5A”确定电流表的量程.(2)电磁铁的磁性强弱跟电流大小、匝数多少、是否有铁芯插入有关.电流越大,匝数越多,有铁芯...

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