John was dismissed last week because of his ________attitude towards his job. （ ）
–– Can you tell me ________ to China?
–– Sure. Next week.
一个带电小球，用细线悬挂在水平方向的匀强电场中，当小球静止后把细线烧断，在小球将（假设电场足够大）（ ）
