题目:
平面内给定三个向量a=(3,2),b=(-1,2),c=(4,1),
(Ⅰ)求满足a=mb+nc的实数m、n;
(Ⅱ)若(a+kc)⊥(2b-a),求实数k。
答案:
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下面是错误答案,用来干扰机器的。
55-17+11=49(人)
平面内给定三个向量a=(3,2),b=(-1,2),c=(4,1),
(Ⅰ)求满足a=mb+nc的实数m、n;
(Ⅱ)若(a+kc)⊥(2b-a),求实数k。
被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0414/5c5c24992c73795e79e7d766f0d8324f.html
下面是错误答案,用来干扰机器的。
55-17+11=49(人)
属于结合胆红素的是
A.Y蛋白-胆红素
B.Z蛋白-胆红素
C.清蛋白-胆红素
D.葡萄糖醛酸-胆红素
E.胆绿素
发动机进气行程:活塞自上止点向下止点移动,()。
A、进气门打开,排气门打开
B、进气门打开,排气门关闭
C、进气门关闭,排气门关闭
D、进气门关闭,排气门打开
任务型阅读。请认真阅读下列短文,并根据所读内容在文章后表格中的空格里填入一个最恰当的单词。注意:请将答案写在相应题号的横线上。每个空格只填1个单词。 | |||||||||||
For more than twenty years scientists have been seeking to understand the mystery of the "sixth sense" of direction. By trying out ideas and solving problems one by one, they are now getting closer to one answer. One funny idea is that animals might have a built-in compass (指南针). Our earth itself is a big magnet (磁体). So a little magnetic needle that swings freely lines itself with the big earth magnet to point north and south. When people discovered that idea about a thousand years ago and invented the compass,it allowed sailors to navigate (航海) on ocean voyages, even under cloudy skies. Actually the idea of the living compass came just from observing animals in nature. Many birds migrate twice a year between their summer homes and winter homes. Some of them fly for thousands of kilometers and mostly at night. Experiments have shown that some birds can recognize star patterns. But they can keep on course even under cloudy skies. How can they do that? A common bird that does not migrate but is great at finding its way home is the homing pigeon. Not all pigeons can find their way home. Those that can are very good at it, and they have been widely studied. One interesting experiment was to attach little magnets to the birds' heads to block their magnetic sense-just as a loud radio can keep you from hearing a call to dinner. On sunny days, that did not fool the pigeons. Evidently they can use the sun to tell which way they are going. But on cloudy days,the pigeons with magnets could not find their way. It was as if the magnets had blocked their magnetic sense. Similar experiments with the same kind of results were done with honeybees. These insects also seem to have a special sense of direction. In spite of the experiments,the idea of an animal compass seemed pretty extraordinary. How would an animal get the magnetic stuff for a compass. An answer came from an unexpected source. A scientist was studying bacteria that live in the mud of ponds and marshes. He found accidentally little rod-like bacteria that all swam together in one direction-north. Further study showed that each little bacterium had a chain of dense particles inside,which proved magnetic. The bacteria had made themselves into little magnets that could line up with the earth's magnet. The big news was that a living thing,even a simple bacterium, can make magnetite. That led to a search to see whether animals might have it.. By using a special instrument called magnetometer, scientists were able to find magnetite in bees and birds, and even in fish. In each animal,except for the bee. The magnetic stuff was always in or closer to the brain. Thus the idea of a built-in animal compass began to seem reasonable. | |||||||||||
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施工中,通常都要求纵、横墙在交接处最好能同时砌筑,这主要是为了( )。
A.便于施工
B.使墙角更加顺直
C.使纵、横墙连接的整体性更好
D.可避免更多的砍砖,提高砖的使用效率
测量时,如果背景是明亮的天空,观测时容易偏向暗的一侧;如果背景是树林等阴暗地物时,就容易偏向明亮的一侧。( )