pen
- I left my pen on the desk and now it‘s gone； who it？
- ——Have you found your pen yet？——No， I‘m not sure__________I have done with it.
- TN系统中，对PEN导体的正确要求是()。Ⅰ：给固定装置供电的电源回路，其PEN导体铜芯截面面积不小于10mm2，铝芯截面面积不小于16mm2；Ⅱ：可用RCD保护有PEN导体的回路；Ⅲ：不得利用剩余电流动作保护器，保护有PEN导体的回路；Ⅳ：成套开关设备和控制设备内部的PEN导体不需要绝缘。
- Is that his pen __________ the lost and found case?[ ]
- Where’s your pen?—It’s _____my pencil case.[ ]
- He has no pen to write _____, because he left his pencil-box at home this morning.[ ]
- Is her pen the same _______yours?[ ]
- Your pen is next _____ the book.[ ]
- Where is London? I have a pen pal there. —It’s ________ England.[ ]
- He needs a pen to write _____. [ ]