您所在的当前位置：高中数学试题 >

平面向量数量积的意义

> 设是任意的非零向量，且相互不共线，则（1）；（2）不与垂直；（3）；（4）中，是真命题的有（） A．（1）（2） B．（2）（3） C．（3）（4） D．（2）（4）

问题：

发布时间：2024-09-12

设是任意的非零向量，且相互不共线，则（1）；（2）不与垂直；（3）；（4）中，是真命题的有（）

A．（1）（2） B．（2）（3） C．（3）（4） D．（2）（4）

参考答案：

提问用户：0z***cL2

可能感兴趣的题目：

1 如图，当A、B两点间接入10欧的电阻时，电流表的示数I 1为0.5安，若A、B间改接20欧的电阻时，则电流表的示数I 2为 A.等于0.25安 B.大于0.25安 C.小于0.25安 D.无法判断
2 用一个正方形在四月份的日历上，圈出4个数，这四个数的和不可能是 A.104 B.84 C.52 D.108
3 The students are busy making preparations for the lecture because they will ______ the competition. A．attend B．join C．take part in D．attend to
4 不能用氯气与金属直接反应制取的物质是 A．NaCl B．CuCl2 C．FeCl2 D．FeCl3
5 There is little food in the fridge , ______ ? A.is it B.isn’t it C.isn’t there D.is there
6 在无色透明溶液中，能大量共存的离子组是（　　） A．K+、Cu2+、NO3-、SO42- B．K+、Na+、Cl-、CO32- C．Mg2+、OH-、NO3-、Cl- D．K+、Na+、MnO4-、SO42-
7 读“农业的主要区位因素图”，回答下列问题：（1）图中字母表示的内容是： A________，B________，C________，D________，E________。（2）影响世界各地农业生产主要因素的差别很大，形成了农业极明显的________特征，因此，农业生产必须坚持________的原则。（3）分析回答形成下列我国各地农业类型的最主要区位因素：横断山区的“立体农业”：________；东北平原农作物大都是一年一熟，华北平原农作物大都是两年三熟：________；东南丘陵红壤地区种植茶树：________。
8 波斯湾的唯一海上出口是 A.土耳其海峡 B.苏伊士运河 C.直布罗陀海峡 D.霍尔木兹海峡
9 —_____ that he picked up his uncle at the airport? —It was at 6:00 in the afternoon _____ he got off work. A．Was it when; that B．When was it; that C．Was it when; when D．When was it; when
10 完形填空。 Known as the Animal Lady in this area which I lived in, I was always asked to lend a hand in animal 1 . One afternoon three little neighbor girls ran up 2 my door, saying a baby squirrel was on the sidewalk. I quickly 3 the kids and they led me to a tiny squirrel still with milk teeth. I 4 and held the little creature up gently in my arms to check it for 5 . It seemed fine. I figured the mother must have been killed, leaving it an orphan (孤儿). Now, the baby was pretty hungry for 6 and then left its nest to search the neighborhood for help. I was about to carry it into my 7 when I found several other babies 8 to run down the tree from where their nest was. With the first squirrel hid into my 9 , I stood at the base of the tree and was 10 when three more babies ran right down into my hands. Those dear little creatures were so happy to feel safe and 11 , and they all held each other close in my shirt. I took them home and 12 them bread and milk to eat. The poor starving things went 13 as they swallowed the meal. I phoned a lady in the next town who 14 a small squirrel shelter. She had a big back yard with large 15 surrounded by a tall wooden fence. She assured me she was well 16 to care for the babies and provide a natural home for them when they were grown. I love that those little girls cared enough about the squirrels to seek out the 17 of the Animal Lady! And I really 18 getting to help the baby creatures. And then the 19 of caring continued 20 the lady with the squirrel shelter took them in. How wonderful to be part of a chain of kindness. ( )1. A. hunt ( )2. A. to ( )3. A. followed ( )4. A. came down ( )5. A. fur ( )6. A. milk ( )7. A. room ( )8. A. pretending ( )9. A. shoe ( )10. A. puzzled ( )11. A. nervous ( )12. A. handed ( )13. A. hungry ( )14. A. owned ( )15. A. ladders ( )16. A. organized ( )17. A. shelter ( )18. A. minded ( )19. A. chain ( )20. A. when B. love B. through B. glanced B. bent down B. legs B. vegetable B. car B. waiting B. pocket B. interested B. cold B. showed B. wild B. needed B. flowers B. equipped B. information B. regretted B. feeling B. if C. cure C. for C. comforted C. put down C. teeth C. nuts C. house C. swinging C. shirt C. astonished C. warm C. gave C. sad C. sought C. bamboos C. built C. advice C. enjoyed C. sense C. before D. rescue D. from D. persuaded D. broke down D. injuries D. leaves D. cage D. starting D. drawer D. satisfied D. tired D. lent D. afraid D. shut D. trees D. known D. help D. appreciated D. connection D. until

设 是任意的非零向量，且相互不共线，则（1） ；（2） 不与 垂直；（3） ；（4） 中，是真命题的有 （ ） A．（1）（2） B．（2）（3） C．（3）（4） D．（2）（4）

可能感兴趣的题目：

设是任意的非零向量，且相互不共线，则（1）；（2）不与垂直；（3）；（4）中，是真命题的有（）

A．（1）（2） B．（2）（3） C．（3）（4） D．（2）（4）