问题
单项选择题
房产面积测量中以()作为限差。
A．相对误差
B．三倍中误差
C．两倍中误差
D．重复抽样标准差
答案
参考答案：C
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房产面积测量中以()作为限差。
A．相对误差
B．三倍中误差
C．两倍中误差
D．重复抽样标准差
参考答案：C
| 完形填空。 | |||
| Even if you are a good high-jumper, you can jump only about seven __1__ off the ground. You cannot jump any higher because the earth __2__ you hard. The pull of the earth is__3__ gravity (引力). You can easily __4__ out the pull of the earth. If you weigh __5__ , you will know how__6__ gravity is pulling you. Since there is gravity, water runs downhill. when you__7_ a ball into the air, it falls back down. Because of gravity, you do not fall off the earth __8__ it turns around. Then, can you get __9__ from the earth and go far out into space? Now you can do it, because spaceships have been invented. The spaceship will go fast that it can get rid of (除掉) the earth's gravity and __10__ you into space. | |||
| ( ) 1. A. kilometer ( ) 2. A. pulls ( ) 3. A. said ( ) 4. A. find ( ) 5. A. myself ( ) 6. A. much ( ) 7. A. fly ( ) 8. A. as ( ) 9. A. off ( ) 10. A. get | B. foot B. push B. called B. look B. yourselves B. many B. throw B. and B. away B. bring | C. feet C. makes C. told C. saw C. you C. heavy C. get C. because C. lost C. carry | D. kilometers D. hits D. spoken D. watch D. yourself D. long D. make D. or D. left D. throw |