关系模式department(code,name)、employee(code,name,sex,dept,phone),查询“研发部”的员工信息,查询结果包括code,name,sex,phone,正确的语句是() A: selectcode,name,sex,phonefromemployeewheredept=’研发部’; B: selectcode,name,sex,phonefromemployeeem,departmentdewherede.code=em.deptandde.dept=’研发部’; C: selectcode,name,sex,phonefromemployeeem,departmentdewherede.code=em.codeandde.name=’研发部’; D: Selectem.code,name,sex,phonefromemployeeem,departmentdewherede.code=em.deptandde.name=’研发部’;

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2022-05-29 问题

关系模式department(code,name)、employee(code,name,sex,dept,phone),查询“研发部”的员工信息,查询结果包括code,name,sex,phone,正确的语句是() A: selectcode,name,sex,phonefromemployeewheredept=’研发部’; B: selectcode,name,sex,phonefromemployeeem,departmentdewherede.code=em.deptandde.dept=’研发部’; C: selectcode,name,sex,phonefromemployeeem,departmentdewherede.code=em.codeandde.name=’研发部’; D: Selectem.code,name,sex,phonefromemployeeem,departmentdewherede.code=em.deptandde.name=’研发部’;

2021-04-14 问题

<img src="http://edu-image.nosdn.127.net/29A02310A7A275558DEB7564D0BE5549.jpg?imageView&thumbnail=890x0&quality=100" />? 2ε(t)- (2t+1) ε(t-1)+ 2ε(t-2)|tε(t)- (t-2) ε(t-1)-2 ε(t-2)|tε(t)- (t-2) ε(t-1)+ ε(t-2)|ε(t)- 2 ε(t-1)+ 2ε(t-2)

<img src="http://edu-image.nosdn.127.net/29A02310A7A275558DEB7564D0BE5549.jpg?imageView&thumbnail=890x0&quality=100" />? 2ε(t)- (2t+1) ε(t-1)+ 2ε(t-2)|tε(t)- (t-2) ε(t-1)-2 ε(t-2)|tε(t)- (t-2) ε(t-1)+ ε(t-2)|ε(t)- 2 ε(t-1)+ 2ε(t-2)

2022-06-03 问题

Ifax+x2=y2-ay,whatisaintermsofxandy? A: y-x B: x-y C: x+y D: (x2+y2)/(x+y) E: (x2+y2)/(x-y)

Ifax+x2=y2-ay,whatisaintermsofxandy? A: y-x B: x-y C: x+y D: (x2+y2)/(x+y) E: (x2+y2)/(x-y)

2022-06-06 问题

Questions71-73:ChoosethebestanswerfromA,B,CandDaccordingtothepassage.（根据短文内容，从A，B，C，D四个选项中选出最佳答案。）（答案涂在答题纸上） WhowroteTheJungleBook? A: AkingofScotland. B: RudyardKipling. C: WilliamShakespeare. D: Mr.Brown.

Questions71-73:ChoosethebestanswerfromA,B,CandDaccordingtothepassage.（根据短文内容，从A，B，C，D四个选项中选出最佳答案。）（答案涂在答题纸上） WhowroteTheJungleBook? A: AkingofScotland. B: RudyardKipling. C: WilliamShakespeare. D: Mr.Brown.

2022-07-27 问题

逻辑函数式P（A，B，C）＝Σm（3，5，6，7）化为最简与或式形式为（）。 A: BC＋AC B: C＋AB C: B＋A D: BC＋AC＋AB

逻辑函数式P（A，B，C）＝Σm（3，5，6，7）化为最简与或式形式为（）。 A: BC＋AC B: C＋AB C: B＋A D: BC＋AC＋AB

2022-07-01 问题

设函数ｙ＝f（x）的定义域为[a，b]，其中b＞－a＞0，那么F（x）＝f（x）＋f（－x）的定义域为（）． A: [a，－a] B: [－b，b] C: [a，b] D: [－b，－a]

设函数ｙ＝f（x）的定义域为[a，b]，其中b＞－a＞0，那么F（x）＝f（x）＋f（－x）的定义域为（）． A: [a，－a] B: [－b，b] C: [a，b] D: [－b，－a]

2022-07-01 问题

向量a，b互相垂直，且∣a∣＝1，则a·（a＋b）＝____.

2022-06-06 问题

Theaverageofa,b,c,d,andeis28.Iftheaverageofa,c,andeis24,whatistheaverageofbandd? A: 31 B: 32 C: 33 D: 34 E: 36

Theaverageofa,b,c,d,andeis28.Iftheaverageofa,c,andeis24,whatistheaverageofbandd? A: 31 B: 32 C: 33 D: 34 E: 36

2022-06-01 问题

WhichofthefollowingchoicescouldbeequaltosetZif X={2,5,6,7,9}andY={2,5,7} X∪Y∪Z={1,2,3,4,5,6,7,8,9} X∩Z={2,6} Y∩Z={2} A: Z={1,4,8} B: Z={1,3,8} C: Z={1,3,4,8} D: Z={1,2,3,4,6,8} E: Z={1,2,3,5,6,8}

WhichofthefollowingchoicescouldbeequaltosetZif X={2,5,6,7,9}andY={2,5,7} X∪Y∪Z={1,2,3,4,5,6,7,8,9} X∩Z={2,6} Y∩Z={2} A: Z={1,4,8} B: Z={1,3,8} C: Z={1,3,4,8} D: Z={1,2,3,4,6,8} E: Z={1,2,3,5,6,8}

2022-06-06 问题

Theaverageofxandyisz,andz=3x+2.Whatistheaverageofyandz? A: 2x+8 B: 2x-16 C: 2x+16 D: x-8 E: x+8

Theaverageofxandyisz,andz=3x+2.Whatistheaverageofyandz? A: 2x+8 B: 2x-16 C: 2x+16 D: x-8 E: x+8

1 2 3 4 5 6 7 8 9 10

逻辑函数式<em>P</em>（<em>A</em>，<em>B</em>，<em>C</em>）＝Σ<em>m</em>（3，5，6，7）化为最简与或式形式为（）。 A: <em>BC</em>＋<em>AC</em> B: <em>C</em>＋<em>AB</em> C: <em>B</em>＋<em>A</em> D: <em>BC</em>＋<em>AC</em>＋<em>AB</em>

向量<em>a</em>，<em>b</em>互相垂直，且∣<em>a</em>∣＝1，则<em>a</em>·（<em>a</em>＋<em>b</em>）＝____.

Theaverageof<em>a</em>,<em>b</em>,<em>c</em>,<em>d</em>,and<em>e</em>is28.Iftheaverageof<em>a</em>,<em>c</em>,and<em>e</em>is24,whatistheaverageof<em>b</em>and<em>d</em>? A: 31 B: 32 C: 33 D: 34 E: 36

Theaverageof<em>x</em>and<em>y</em>is<em>z</em>,and<em>z</em>=3<em>x</em>+2.Whatistheaverageof<em>y</em>and<em>z</em>? A: 2<em>x</em>+8 B: 2<em>x</em>-16 C: 2<em>x</em>+16 D: <em>x</em>-8 E: <em>x</em>+8