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【判断题】
一钻以下的集市商家免费使用旺铺专业版。A.
正确
B.
错误
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举一反三
【单选题】以下是对关系数据库结构的描述，请选择错误描述的选项。（ ）
A.
数据存储的主要载体是表，或相关数据组
B.
有一对一、一对多、多对多三种表关系
C.
表关联是通过引用完整性定义的，这是通过主码和外码（主键或外键约束条件实现的）
D.
缺点是不支持SQL语言
【简答题】阅读理解。 Football is a very popular in China. There are eleven players in a team. Many people like it. Li Lei is a middle-school student. He likes football. Tomorrow is Sunday. There's nothing much ...
【单选题】— There used to be lots of fish in the lake. — Yes, but there are very __________ now.
A.
few
B.
fewer
C.
little
D.
less
【单选题】有关表格创建与结构修改,描述错误的有
A.
数据结构修改以后无法保存,是因为没有取消禁止保存选项
B.
Score表无法创建外键是因为score表中的数据在主键表中找不到
C.
删除或关闭了创建表格的SQL语句,对应的表格也将被删除,
D.
英文字符和中文字符使用了nchar或者nvarchar数据类型,都将占用相同字节
【简答题】The sea looks very beautiful when the sun is shining on it.It can be very terrible when there is a strong wind. The sea is very big.It covers three quarters of the earth.The sea is also very deep in s...
【单选题】看下图有关轴的结构和材料的描述中,错误的是
A.
该轴是直轴,外形阶梯,内部空心结构,可同时承受转矩和弯矩
B.
前后支承的两组轴承、主轴箱和螺钉等固定并支承主轴
C.
齿轮和套筒用键固定在主轴上,实现周向固定并传递转矩
D.
轴承在工作时承受的是径向和轴向载荷,采用的滚动轴承材料是 GCr15
【简答题】完形填空 There was a very special teacher who made a far-reaching difference in my life. Fa11,1959,the first day of class at Bethesda Chevy Chase High School was about to begin, 'Who' . I asked a senior, ...
【单选题】Look over there-there's a very long, winding path _____ up to the house. [ ]
A.
leading
B.
leads
C.
led
D.
to lead
【单选题】Look over there—there’s a very long, winding path _________ to the house.
A.
leading
B.
leads
C.
led
D.
to lead
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