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【单选题】
标准的比赛篮球充气后从1.80米的高度自由下落到地面上反弹的高度不得低于1.20米，也不得高于（）。
A.
1.30米
B.
1.40米
C.
1.45米
D.
1.50米
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参考答案：
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
查看完整题目与答案
【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 ...
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【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
查看完整题目与答案
【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
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【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...
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【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
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【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, ...
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【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
查看完整题目与答案
【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
查看完整题目与答案
【单选题】下列关于外部设备的描述,错误的是( )
A.
键盘根据物理结构可以分为机械式键盘、电容式键盘和薄膜式键盘
B.
鼠标按照工作原理,可以分为机械鼠标、光电鼠标
C.
目前常用的显示器按使用的元器件可以分为CRT、LED和PDP显示器
D.
衡量扫描仪的技术指标主要有分辨率、扫描幅面、色彩位数和感光元件
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相关题目：
【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
查看完整题目与答案
【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 ...
查看完整题目与答案
【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
查看完整题目与答案
【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
查看完整题目与答案
【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...
查看完整题目与答案
【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
查看完整题目与答案
【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, ...
查看完整题目与答案
【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
查看完整题目与答案
【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
查看完整题目与答案
【单选题】下列关于外部设备的描述,错误的是( )
A.
键盘根据物理结构可以分为机械式键盘、电容式键盘和薄膜式键盘
B.
鼠标按照工作原理,可以分为机械鼠标、光电鼠标
C.
目前常用的显示器按使用的元器件可以分为CRT、LED和PDP显示器
D.
衡量扫描仪的技术指标主要有分辨率、扫描幅面、色彩位数和感光元件
查看完整题目与答案
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