【单选题】Shall I lock the lab before I go home? __________. I’ll check it myself later.
【单选题】-'I’m afraid I must be going now. I ’ 11 come to see you before long.
【判断题】贾元春才选凤藻宫,这样的好消息对于贾家人来讲非常突然,一天不知是福是祸,很紧张。
【判断题】当直线相关系数r=0时,说明变量之间不存在相关关系。 ( )
【简答题】I didn't go to see the film, because I ______ (see)it before.
【判断题】当直线相关系数 R=0 时,说明变量之间不存在任何相关关系。