已知P1(2,-1),P2(0,5)且点P在P1P2的延长线上,|P1P|=2|

题型:选择题

问题:

已知P1(2,-1),P2(0,5)且点P在P1P2的延长线上,|
P1P
|=2|
PP2
|,则点P的坐标为(  )
A.(2,11)B.(
4
3
,3)
C.(
2
3
,3)
D.(-2,11)
考点:平面向量基本定理及坐标表示
题型:选择题

缺词填空。

     Most children today go to a school where each class has its o 1  room. It was d 2  many years ago.

Most children w  3  to a one-room schoolhouse. In a one-room schoolhouse  all the children learned in

one room from the s  4  teacher. A fourth grader might have sat next to a n  5     grader.  Possibly you

have seen a one-room schoolhouse o  6  a television program.

    There w    7     a good reason for many of   the one-room   schoolhouse.   They were often  in  the

countryside, where there were o  8    ten to  twenty children going to school.  Then one room was big

e  9  for everyone! Today there are many m  10  children going to school. The one-room schoolhouse

has just about disappeared.

1. ________ 2. ________  3. ________  4. ________   5. ________

6. ________ 7. ________  8. ________  9. ________   10. ________

题型:选择题

图像分割中可供选择的连通性准则有两种:()和()。

题型:选择题

我们平时吃的“豆芽”菜,主要是由绿豆的哪一结构发育而来的

A.胚根

B.胚芽

C.胚轴

D.子叶

题型:选择题

狂犬病病毒的主要传播途径是()

A.飞沫传播

B.粪-口传播

C.虫媒传播

D.直接接触传播

E.血液传播

题型:选择题

有如下程序:
#include"iostrearn.h"
void main( )

int x=1,a=0,b=0;
switch(x)
case 0:b++;
case 1:a++;
case 2:a++;b++;

cout<<"a="<<a<<","<<"b="<<b;

该程序的输出结果是

A.a=2,b=1

B.a=1,b=1

C.a=1,b=0

D.a=2,b=2

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