问题
单项选择题
向量
={4，-7，4}在向量
={2，1，2}上的投影为（）。
A.1/3〔4，-7，4〕
B.〔2，1，2〕
C.3
D.1
答案
参考答案：C
搜题请搜索小程序“爱下问搜题”
向量={4，-7，4}在向量={2，1，2}上的投影为（）。
A.1/3〔4，-7，4〕
B.〔2，1，2〕
C.3
D.1
参考答案：C
| 完形填空 | ||||
| Many language learners think their pronunciation is good enough because their teacher doesn't correct them too often or because other students can __1__ them. Pronunciation is the area which is __2__ the least attention to in language learning. Working on each student's pronunciation in class is just __3__. Also, the students who are __4__ at pronunciation may be afraid that it will embarrass their classmates if they help __5__ their mistakes. If you believe your pronunciation is good enough to __6__ because it is good enough for your teacher and other students, you may be __7__ when you actually go to a foreign country. One of my friends was the best student in his __8__ class in Poland. When he went to America, he found Americans didn't understand what he said. Your pronunciation may still be quite different from that of a native speaker. If this is the __9__, other people will find it __10__ to understand what you're saying and will not be comfortable with you. __11__, don't think you can communicate in a foreign language until you've tested your skills on real native speakers. __12__ for native or nearnative pronunciation so that people you talk to can communicate with you __13__. In order to achieve this goal, there's __14__ that you will need to start thinking about pronunciation and __15__ time on it. | ||||
|