在阀门附近取压时，若取压口选在阀门前，则与阀门的距离应大于（）。
A.1D
B.2D
C.3D
D.4D
参考答案：B
They _____ on the little professor, but it led to his fierce criticism on us. [ ]
A. played a joke
B. made fun
C. had fun
D. performed a joke
下列（）情况下，要对高压计量箱进行耐压试验。
A.A类检修后
B.B类检修后
C.检验主绝缘可靠性时
D.例行试验时
