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如图，A1、A2、A3是抛物线y=ax2+bx+c上的三点，A1B1、A2B2、A3B3分别垂直于x轴，垂足为B1、B2、B3，直线A2B2交线段A1A3于点C，A1、A2、A3三点的横坐标为连续整...
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教案备课库《初三年级数学国庆作业（二）》真题及答案
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如图在平面直角坐标系中抛物线与x轴交于点A.﹣10和点B.10直线y=2x﹣1与y轴交于点C.与抛物
给定关系RA1A2A3A4上的函数依赖集F=A1→A2A3→A2A2→A3A2→A4R的候选关键字为
A1
A1A3
A1A3A4
A1A2A3
三个简支梁所受载荷相同均为力偶其力偶矩为m支座如图示分别以NA1NA2NA3表示三种情况下支座A的
N
A2
＜N
A1
=N
A3
N
A2
=N
A3
=N
A1
N
A1
=N
A2
＞N
A3
N
A2
=N
A1
＜N
A3
给定关系RA1A2A3A4上的函数依赖集F=A1→A2A3→A2A2→A3A2→A4｝R的候选关键字
A1
A1A3
A1A3A4
A1A2A3
给定关系RA1A2A3A4上的函数依赖集F=A1A3→A2A2→A3R候选关键字为1分解p=A
A1A3
A1A2A3
A1A3A4
A2和A1A3
给定关系RA1A2A3A4上的函数依赖集F=A1A3-＞A2A2-＞A3及候选关键字为41分解
A1A3
A1A2A3
A1A3A4
A2和A1A3
三个简支梁所受载荷相同均为力偶其力偶矩为m支座如图示分别以NA1NA2NA3表示三种情况下支座A的
N
A2
＜N
A1
=N
A3
N
A2
=N
A3
=N
A1
N
A1
=N
A2
＞N
A3
N
A2
=N
A1
＜N
A3
如图四边形ABCD是菱形点D的坐标是0以点C为顶点的抛物线y＝ax2＋bx＋c恰好经过x轴上AB两点
设ρ={A1A2A1A3}是关系RA1A2A3上的一个分解下表是R上的一个关系实例rR的函数依
F={A1→A2，A1→A3}
F={A1→A2}
F={A1→A2}
F={A1A3→A2，A1A2→A3}
给定关系RA1A2A3A4上的函数依赖集F={A1→A2A3→A2A2→A3A2→A4}R的候选关键
A1
A1A3
A1A3A4
A1A2A3
以下正确的赋值语句是
A1，A2，A3=10
SET 10 TO A1，A2，A3
LOCAL 10 TO A1，3．2，A3
STORE 10 TO A1，A2，A3
三个简支梁所受载荷相同均为力偶其力偶矩为m支座如图示分别以NA1NA2NA3表示三种情况下支座A的
N
A2
＜N
A1
=N
A3
N
A2
=N
A3
=N
A1
N
A1
=N
A2
＞N
A3
N
A2
=N
A1
＜N
A3
在Excel97中要在B1单元格中显示A1A2A3单元格中数据的平均值错误的公式是
=(A1+A2+A3)/3
=SUM(A1:A3)/3
=AVERAGE(A1:A3)
=AVERAGE(A1:A2:A3)
给定关系RA1A2A3A4上的函数依赖集F=A1A3-＞A2A2-＞A3R候选关键字为4分解ρ=A1
是无损联结的
是保持函数依赖的
既是无损联结又保持函数依赖
既是有损联结又不保持函数依赖
设抛物线y=ax2+bx+ca≠0过A.02B.43C.三点其中点C.在直线x=2上且点C.到抛物线
给定关系RA1A2A3A4上的函数依赖集F=A1→A2A3→A2A2→A3A2→A1R的候选关键字为
A1
A1A3
A1A3A4
A1A2A3
给定关系RA1A2A3A4上的函数依赖集F=A1A3-＞A2A2-＞A3R候选关键字为4分解ρ=A1
A1A3
A1A2A3
A1A3A4
A2和A1A3
三个简支梁所受载荷相同均为力偶其力偶矩为m支座如图示分别以NA1NA2NA3表示三种情况下支座A的
N
A2
＜N
A1
=N
A3
N
A2
=N
A3
=N
A1
N
A1
=N
A2
＞N
A3
N
A2
=N
A1
＜N
A3
在Excel中求A1A2A3单元格中数据的平均值下列公式错误的是
=A1+A2+A3/3
=SUM（A1：A3）/3
=AVERAGE（A1：A3）
=AVERAGE（A1：A2：A3）
以下正确的赋值语句是
A1,A2,A3=10
SET 10 TO A1,A2,A3
LOCAL 10 TO A1,A2,A3
STORE 10 TO A1,A2,A3
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