问题
单项选择题
相对误差是（）之比的百分数。
A、测量的绝对误差与测量值
B、测量的绝对误差与被测量真值
C、测量值与被测量真值
D、测量的修正值与被测量真值
答案
参考答案：B
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相对误差是（）之比的百分数。
A、测量的绝对误差与测量值
B、测量的绝对误差与被测量真值
C、测量值与被测量真值
D、测量的修正值与被测量真值
参考答案：B
| 用方框中所给词的适当形式填空，使短文正确、通顺。每个词限用一次。 | |
talk about the universe, we mean the earth, the sun, the moon and the (2) . Now let me tell you something about our earth. The earth is a huge ball. It (3) round and round in space. Its surface (表面) is (4) by water and land. If you are in a space plane and look (5) at the earth from up in space, you will see lots of clouds over the surface of the earth. (6) clouds you will see the blue colour of the oceans and seas. (7) two-thirds of the earth is covered with water. We live on the outside (8) of the earth. Around and above us is the air. The earth takes twenty-four (9) to turn all the way round-that is one day and one night. When your country is facing (朝向) the sun, it is day-time for you. But as the earth turns you away from the sun, everything around you grows, (10) . Can you tell me something more about the earth or the universe? |