【单选题】土地承包经营权以签订承包合同的方式产生,且于( )权利设立。
【简答题】我国现行《海船船员值班规则》规定,一定时间内的平均工作小时最长每天不应超过________。
【单选题】-How did you the money? -We helped an elementary school in our city.
【单选题】_____ a new library_____ in our school last year? [ ]
【单选题】Our school did not______for Christmas until mid-December.
【单选题】当AT89S51单片机复位时,下面说法正确的是 。