题目内容

设有关系模式S(A，B，C，的），则SQL语句“SELECT A，C FROM S”能够完成的关系运算是选择和【】。

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&8226;You are the Purchasing Manager for a large company. Last week you decided to look for a new supplier for stationery and office equipment. Now you are thinking of Compass Office Goods Ltd. as a new supplier.
&8226;Write a memo to your company's department heads.
&8226;explaining why you looked for a new supplier
&8226;saying who the. new supplier is
&8226;asking for feedback about the goods that they supply.
&8226;Write 40-50 words.
MEMO
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________

计划的本质是达成组织目标，控制是保证目标达成的手段，时间管理是其中重要的一环。()

目标管理是一个动态的、连续循环过程。()

在目标设置过程中，上行的目标设置是有每一位目标执行人的上级决定具体的工作目标。()