【单选题】在( )中,气体间隙局部达到自持放电时,会出现电晕放电,但间隙并不击穿。必须进一步增高电压,才能使间隙击穿。
【判断题】《保护工业产权巴黎公约》是保护商标权的国际公约。
【判断题】世界上第一部有关知识产权的国际公约是《保护工业产权巴黎公约》。判断对错
【单选题】When the students heard the good news, they jumped _______ in the classroom. [ ]
【单选题】____the news, they jumped with joy.
【简答题】When they heard the good news, they jumped with ________.(enjoy)