人体内维生素B12贮存量为（） A.1～2mg B.2～3mg C.3～4mg D._爱下问搜题

搜题请搜索小程序“爱下问搜题”

问题单项选择题 A1/A2型题

人体内维生素B₁₂贮存量为（）

A.1～2mg

B.2～3mg

C.3～4mg

D.4～5mg

E.5～10mg

答案

参考答案：D

选择题

Excuse me, could you tell me________?

A．where can I have my MP4 repaired

B．what was happened to you

C．how could I go to the e-shop

D．what is wrong with your bike

问答题简答题

简述戏剧艺术的起源？