单项选择题

心电图的基本图形及等电位线消失，QRS-T波被波形一致且宽大整齐的大正弦波替代，频率约200~250次/min，应考虑（）

A.心房扑动
B.心房颤动
C.心室扑动
D.心室颤动

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Only the water which belongs to Class I～Class III can be used as drinking water source. ( )

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‌实地使用照片法的步骤包括‏
‌The steps of using photo survey in the field include‏

A．简介调查目的
a brief introduction to the survey
B．以上三个
above three
C．出示照片
showing photos to interviewees
D．询问被试并记录
asking the interviewees questions and recording their answers