问题
单项选择题
将全部质量数据分成若干组，以组距为底边，以该组距相应频率为高，按比例构成若干矩形，即为（）。
A.排列图
B.散布图
C.直方图
D.控制图
答案
参考答案：C
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将全部质量数据分成若干组，以组距为底边，以该组距相应频率为高，按比例构成若干矩形，即为（）。
A.排列图
B.散布图
C.直方图
D.控制图
参考答案：C
| 完形填空。 | |||
| What do you know about the sea? We have seen it. Some of us have swum in it. We know that it 1 very nice when the sun is 2 on it. We also know that it can be very terrible 3 it's windy. What other things do we know about it? The first thing to remember is that the sea is very big when you look at the map 4 the world, and you will 5 there is more sea than land. The sea covers three-quarters of the world. If you have swum 6 the sea, you' know that it is salty. You can taste the salt. __7 go into the sea and carry salt from the land into the sea. Some parts of the sea are saltier than 8 parts. | |||
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