皮皮学，免费搜题
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【单选题】
下列叙述中错误的是( )。A.
使用数据表设计视图，不仅可以创建表，而且可以修改已有表的结构
B.
如果在保存表之前未定义主键，则 Access 将询问是否由系统自动添加一个主键
C.
每张数据表必须设定主键
D.
每种类型的字段都有一个特定的属性集
拍照语音搜题，微信中搜索"皮皮学"使用
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皮皮学刷刷变学霸
举一反三
【简答题】We often ________ (play) on the playground．
【单选题】虽然价廉，但适用范围广，也可考虑单独使用。因它适用于大型计算机综合无人化管理系统，所以近年来的需要显著增加。
A.
平面式自动仓库
B.
楼式自动仓库
C.
单元式自动仓库
D.
立体式自动仓库
【简答题】投入产出分析与马克思主义再生产理论有哪些联系?
【简答题】听力原文：Often, we learn wisdom from failure. We often discover what we will do by finding out what we cannot do. And probably he who never made a mistake never made a discovery. (55)
【单选题】--- Could you tell us ______? ---- About two weeks.
A.
how often are we going to be away
B.
how often we are going to be away
C.
how long are we going to be away
D.
how long we are going to be away
【单选题】( )虽然价廉,但适用范围广,也可考虑单独使用。因它使用于大型计算机综合无人化在线管理系统,所以近年来的需要显著增加。
A.
平面式自动仓库
B.
楼式自动仓库
C.
单元式自动仓库
D.
立体式自动仓库
【单选题】We _____ at school from Monday to Friday. [ ]
A.
is often
B.
are often
C.
often is
D.
often are
【简答题】Help was often given to him by us. We often ______ him ______.
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