1两个向量的数量积:
(1)设两个非零向量与,称∠AOB=为向量与的夹角, (00≤θ≤1800),当非零向量与同方向时,θ=00,当与反方向时θ=1800,与其它非零向量不谈夹角问题
(2)数量积的定义:·=︱︱·︱︱cos, 叫做与的数量积; 规定,其中︱︱cos∈R,叫向量在方向上的投影.
2.数量积的几何意义: ·等于的长度与在方向上的投影的乘积.
2.了解用平面向量的数量积可以处理有关长度、角度和垂直的问题.
1.掌握平面向量的数量积及其几何意义; 掌握向量垂直的条件;
84.My parents always let me have my own ____of living. (1999.上海25) A. way B. method C. manner D. fashion
语法复习十五:名 词
1~5 BBDDD 6~10 BBCAA 11~15 ABCCB 16~20 DAACD 21~25 DBDCD
26~30 BADBD 31~35 AABDC 36~40 BACCB 41~45 ABDCA 46~50 BABCB
51~55 BDDCD 56~60 ABCCB 61~65 BACAA 66~70 DADCA 71~75 CDCBD
76~80 ADCAD 81~84 ACDA
73.We have worked out the plan and now we must put it into ___.(NMET1997 38) A. fact B. reality C. practice D. deed 74.We've missed the last bus. I'm afraid we have no ____but to take a taxi.(Met 1993 ,33) A. way B. choice C. possibility D. selection 75.He dropped the ___and broke it . (Met 1993, 38) A. cup of coffee B. coffee's cup C. cup for coffee D. coffee cup 76.Here's my card. Let's keep in ____. (NMET1994 ,33) A. touch B. relation C. connection D. friendship 77.He gained his ___by printing ___of famous writers.(NMET1995,40) A. wealth; work B. wealths ; works C. wealths; work D. wealth; works 78.I'll look into the matter as soon as possible , just have a little ___.(MET 1996 ,10) A. wait B. time C. patience D. rest 79.If by any chance someone comes to see me, ask them to leave a ____.(NMET1997,18) A. message B. letter C. sentence D. notice 80.These football players had no strict ___until they joined our club. (1997.上海 20) A. practice B. education C. exercise D. training 81.Many countries are increasing their use of natural gas, wind and other forms of ___.(1996.上海.15) A. energy B. source C. power D. material 82.You'll find this map of great __in helping you to get round London.(NMET 1998 21) A. price B. cost C. value D. usefulness 83.We all know that ___speak louder than words.(1999.上海 24) A. movements B. performances C. operations D. actions
66. When you play' football, what ______do you play? A. situation B. place C. part D. position 67. It's important for us to employ a word or a phrase according to the______in language studies. A. situation B. expression C. condition D. translation 68. I wrote him a letter to show my ______of his thoughtfulness. A. achievement B. agreement C. view D. appreciation 69. One of the advantages of living on the top floor of a high-rise is that you can get a good______ . A. sight B. scene C. view D. look 70. Nowadays natural gas, wind and other forms of ______are widely used in the country. A. energy B. force C. power D. materials 71. ______with foreign countries can bring us much information about the world. A. Contrast B. Competition C. Contact D. Combination 72. We all know that______speak louder than words.
A. movements B. performances C. operations D. actions
59. He had tried everything but it made little______ . A. use B. good C. difference D. result 60. You must get there within half an hour. There should be no______ in sending the blood to the dying man. A. wait B. delay C. time D. hurry 61. Enough of it! Nobody here thinks what you are saying should make any______ . A. excuse B. sense C. use D. value 62. -How dare you play on such thin ice? -Playing on ice is not my ______of spare time. A. idea B. thought C. mind D. intention 63. Helen said she would like to go to Atlanta by air, but I wonder if she has enough money to pay for the______ . A. travel B. tourism C. journey D. course 64. One splendid mountain______ followed another during our journey from Mieheel more to Rurunz. A. view B. glance C. screen D. scene 65.The new law will come into ___on the day it is passed. (1999上海)
A. effect B. use C. service D. existence
58. There are thirty-two ____ in our school.
A. woman teacher B. women teacher C. women teachers D. woman teachers
57. The population of Beijing is ____ than that of Xi’an. A. more B. larger C. fewer D. small
56. I have made ____ with Billy. A. friends B. friend C. a friend D. the friend
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