下列疾病哪一项是缺乏维生素C所引起的( )
A.佝偻病
B.坏血病
C.糖尿病
D.肝炎
维生素的功能及缺乏症如图:
可见缺乏维生素C易患坏血病.
故选:B
There is still so much work to do that a holiday for me this week is ______.
A.out of the question
B.beyond question
C.without question
D.out of question
凡使用精密、贵重、大型检测仪器设备,必须取得( )才能操作。
A.等级证书
B.资质证书
C.操作证书
D.上岗证书