问题
单项选择题
卵石、碎石表观密度取两次试验结果的算术平均值，两次试验结果之差超过20kg/m3，应重新试验.对颗粒材质不均匀的试样，如两次试验结果之差超过20kg/m3，可取（）次试验结果的算术平均值.
A、3
B、4
C、5
D、6
答案
参考答案：B
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卵石、碎石表观密度取两次试验结果的算术平均值，两次试验结果之差超过20kg/m3，应重新试验.对颗粒材质不均匀的试样，如两次试验结果之差超过20kg/m3，可取（）次试验结果的算术平均值.
A、3
B、4
C、5
D、6
参考答案：B
| 补全对话。 | |
| A: Mr. Fred, you often help children. 1 B: Yes, of course. Children often write to me and ask me how to solve their problems. A: 2 B: Many can't decide when to study and when to play. I think they should learn to achieve a balance between study and play. A: I agree. Sometimes I get too much homework and 3 B: You must feel stressed from time to time, right? A: Yes. Can you give me some advice? B: OK. 4 A: I see. Any more? B: Yes. You can also get help from youth workers at your own school. A: Thanks for your advice. B: 5
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