皮皮学，免费搜题
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【单选题】
实现信息安全最基本、最核心的技术是
A.
身份认证技术
B.
防病毒技术
C.
访问控制技术
D.
加密技术
拍照语音搜题，微信中搜索"皮皮学"使用
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举一反三
【判断题】Roles within the buying center are socially constructed, which means people define how they will act in the business-to-business purchase process and how they will interact with others.
A.
正确
B.
错误
查看完整题目与答案
【单选题】The government reversed its decision to build nuclear reactors; now they will not be constructed.
A.
made
B.
stuck to
C.
ratified
D.
gave up
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【简答题】Civil engineering projects don ’ t exist in the classroom or in the office or in the laboratory. They exist out in the field, in society. They are the highways, the transit systems, the land-slides to...
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【简答题】The carpet on the floor was stained and torn, the windows nearly __________ with dirt, and the walls looked as if they had never been repainted since the place was constructed.
查看完整题目与答案
【简答题】（本小题满分12分）在直角坐标系xOy中，曲线C 1 的点均在C 2 ：（x-5） 2 ＋y 2 =9外，且对C 1 上任意一点M，M到直线x=﹣2的距离等于该点与圆C 2 上点的距离的最小值. （1）求曲线C 1 的方程； （2）设P(x 0 ,y 0 )（y 0 ≠±3）为圆C 2 外一点，过P作圆C 2 的两条切线，分别与曲线C 1 相交于 点A，B和C，D.证明：当P在直线x=﹣4上运动时...
查看完整题目与答案
【简答题】在直角坐标系xOy中，曲线C 1 的点均在C 2 ：（x-5） 2 +y 2 =9外，且对C 1 上任意一点M，M到直线x=-2的距离等于该点与圆C 2 上点的距离的最小值。 （1）求曲线C 1 的方程； （2）设P（x 0 ，y 0 ）（y 0 ≠±3）为圆C 2 外一点，过P作圆C 2 的两条切线，分别与曲线C 1 相交于点A，B和C，D，证明：当P在直线x=-4上运动时，四点A，B，C，D的...
查看完整题目与答案
【简答题】在直角坐标系xOy中，曲线C 1 的点均在C 2 ：（x-5） 2 ＋y 2 =9外，且对C 1 上任意一点M，M到直线x=﹣2的距离等于该点与圆C 2 上点的距离的最小值. （Ⅰ）求曲线C 1 的方程； (1-4班做)（Ⅱ）设P(x 0 ,y 0 )（y 0 ≠±3）为圆C 2 外一点，过P作圆C 2 的两条切线，分别与曲线C 1 相交于点A，B和C，D.证明：当P在直线x=﹣4上运动时，四点A...
查看完整题目与答案
【单选题】设一动点P到直线x=3的距离与它到点A（1，0）的距离之比为 3 3 ，则动点P的轨迹方程是（　　）
A.
x 2 3 + y 2 2 =1
B.
x 2 3 - y 2 2 =1
C.
(x-4 ) 2 3 - y 2 6 =1
D.
x 2 2 + y 2 3 =1
查看完整题目与答案
【单选题】The words "about" or "approximately" used in connection with the amount of the credit or the quantity or the unit price stated in the credit are to be constructed as allowing a tolerance not to exceed...
A.
3%
B.
5%
C.
7%
D.
10%
查看完整题目与答案
【简答题】What role do frames play in the way they are constructed so that bargainers define problems and courses of action jointly through their talk?
查看完整题目与答案
相关题目：
【判断题】Roles within the buying center are socially constructed, which means people define how they will act in the business-to-business purchase process and how they will interact with others.
A.
正确
B.
错误
查看完整题目与答案
【单选题】The government reversed its decision to build nuclear reactors; now they will not be constructed.
A.
made
B.
stuck to
C.
ratified
D.
gave up
查看完整题目与答案
【简答题】Civil engineering projects don ’ t exist in the classroom or in the office or in the laboratory. They exist out in the field, in society. They are the highways, the transit systems, the land-slides to...
查看完整题目与答案
【简答题】The carpet on the floor was stained and torn, the windows nearly __________ with dirt, and the walls looked as if they had never been repainted since the place was constructed.
查看完整题目与答案
【简答题】（本小题满分12分）在直角坐标系xOy中，曲线C 1 的点均在C 2 ：（x-5） 2 ＋y 2 =9外，且对C 1 上任意一点M，M到直线x=﹣2的距离等于该点与圆C 2 上点的距离的最小值. （1）求曲线C 1 的方程； （2）设P(x 0 ,y 0 )（y 0 ≠±3）为圆C 2 外一点，过P作圆C 2 的两条切线，分别与曲线C 1 相交于 点A，B和C，D.证明：当P在直线x=﹣4上运动时...
查看完整题目与答案
【简答题】在直角坐标系xOy中，曲线C 1 的点均在C 2 ：（x-5） 2 +y 2 =9外，且对C 1 上任意一点M，M到直线x=-2的距离等于该点与圆C 2 上点的距离的最小值。 （1）求曲线C 1 的方程； （2）设P（x 0 ，y 0 ）（y 0 ≠±3）为圆C 2 外一点，过P作圆C 2 的两条切线，分别与曲线C 1 相交于点A，B和C，D，证明：当P在直线x=-4上运动时，四点A，B，C，D的...
查看完整题目与答案
【简答题】在直角坐标系xOy中，曲线C 1 的点均在C 2 ：（x-5） 2 ＋y 2 =9外，且对C 1 上任意一点M，M到直线x=﹣2的距离等于该点与圆C 2 上点的距离的最小值. （Ⅰ）求曲线C 1 的方程； (1-4班做)（Ⅱ）设P(x 0 ,y 0 )（y 0 ≠±3）为圆C 2 外一点，过P作圆C 2 的两条切线，分别与曲线C 1 相交于点A，B和C，D.证明：当P在直线x=﹣4上运动时，四点A...
查看完整题目与答案
【单选题】设一动点P到直线x=3的距离与它到点A（1，0）的距离之比为 3 3 ，则动点P的轨迹方程是（　　）
A.
x 2 3 + y 2 2 =1
B.
x 2 3 - y 2 2 =1
C.
(x-4 ) 2 3 - y 2 6 =1
D.
x 2 2 + y 2 3 =1
查看完整题目与答案
【单选题】The words "about" or "approximately" used in connection with the amount of the credit or the quantity or the unit price stated in the credit are to be constructed as allowing a tolerance not to exceed...
A.
3%
B.
5%
C.
7%
D.
10%
查看完整题目与答案
【简答题】What role do frames play in the way they are constructed so that bargainers define problems and courses of action jointly through their talk?
查看完整题目与答案