火花间隙法检测绝缘子,作业前校核火花间隙距离,220kV球—球电极距离为()。
A.0.3mm;
B.0.4mm;
C.0.5mm;
D.0.6mm。
参考答案:D
下列属于复合肥的是( )
A.NH4C1
B.CO(NH2)2
C.KNO3
D.K2SO4
在空白处填入适当的句子,使对话完整。
Secretary: Hello, can I help you?
Jane Black: Yes.小题1:___________________________________________________?
Secretary: May I ask who’s calling?
Jane Black: This is Jane Black.
Secretary:小题2: ________________________________________. I’m sorry, Alice is at a meeting right now. 小题3:________________________________?
Jane Black: 小题4: _____. Could you tell her that I’ll be free tomorrow?
Secretary: Sure. Bye.
Jane Black: 小题5: _____________________.