【简答题】二 书面表达,按照通知的要求填写合适的信息 : ( 共 1 题;满分 5 分 ) Jenny took a sick leave yesterday. She is writing a memo to Mary Tong at Human Resources. Please put the sentences in order to help her complete the memo. Jenn...
【简答题】在(1)的基础上,使用summaryBy()函数计算各科成绩的平均值,可写作: summaryBy(________ ~ ______ , __________)
【简答题】书面表达,按照通知的要求填写合适的信息 : ( 共 1 题;满分 5 分 ) Jenny took a sick leave yesterday. She is writing a memo to Mary Tong at Human Resources. Please put the sentences in order to help her complete the memo. Jenny ...