问题
单项选择题
管路的管径可根据管路的（）计算出来。
A、质量和流量
B、流速和密度
C、体积流量和流速
D、体积流量和截面积
答案
参考答案：C
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管路的管径可根据管路的（）计算出来。
A、质量和流量
B、流速和密度
C、体积流量和流速
D、体积流量和截面积
参考答案：C
We arrived Mount Tai in the morning with my parents. That a beautiful day. We our trip at 9:00. in my family took a bag some food and water. three hours, we got to the top. I was so tired that I wanted to have a rest. the city looked wonderful from the top of the hill! Then we had our lunch at 1:00 p.m. .After a while, it hardly, so everyone put a raincoat on. You think we would feel sad. No. We were excited, because we saw wonderful waterfall in the mountain. It was so beautiful we forgot about the last 3 hours. At 4 p.m., we came back to the foot of mountain. My father bought tea for my grandparents. My mother bought a beautiful necklace for . I didn’t buy anything, because there was too expensive, and I didn’t have much money.
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