电动潜油泵井调整过欠载值时，要缓慢操作，边调整、边观察显示值，直到显示为所需要的（）值为止。
A、过载
B、欠载
C、电流
D、电压
参考答案：C
— Jack has spent an hour in the shoe shop．Hasn't he decided which pair of shoes to buy?
— Maybe．Young as he is, he is about his appearance．
A．special
B．curious
C．particular
D．confident
传染性变态反应所属的变态反应类型是
A．Ⅰ型变态反应
B．Ⅱ型变态反应
C．Ⅲ型变态反应
D．Ⅳ型变态反应
E．Ⅴ型变态反应
