6～10kV的验电器作交流耐压试验时，施加的试验电压为（）kV，试验时间为5min。
A.11；
B.22；
C.33；
D.44。
参考答案：D
The boys when the teacher came in. So she was very angry．
A．were doing homework
B．were cleaning the classroom
C．were fighting
D．were learning English
婴幼儿少尿的标准为一昼夜尿量少于（）
A.200ml
B.300ml
C.400ml
D.500ml
E.600ml
