问题
单项选择题
用孔板测量某种气体的流量，假定该气体的压力不高，温度亦不高，接近于理想气体，那么，在孔板设计中，流束膨胀系数ε将（）。
A、 ＝1
B、 ＞1
C、 ＜1
D、 不确定
答案
参考答案：C
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用孔板测量某种气体的流量，假定该气体的压力不高，温度亦不高，接近于理想气体，那么，在孔板设计中，流束膨胀系数ε将（）。
A、 ＝1
B、 ＞1
C、 ＜1
D、 不确定
参考答案：C
| 读短文，按要求做题。 | |||
| Today is Wednesday, September l . It's warm and 2 . I have breakfast 3 7: 30 in the morning. Then I go to school on my bike. I work hard at school. I have 4 at school. We have four classes in the morning, and three classes in the afternoon. I like _ 5 best. Because I like to play ping-pong. I go h. ome at 4: 30 inthe afternoon. Oh! It's Teachers' Day. I give our teachers some beautiful flowers. I love my teachers. | |||
| (一)完形填空。 | |||
1. What day is it today? --_________________________________ 2. What do you do at 4:30 in the afternoon? --_________________________________ 3. How do you go to school? --_________________________________ 4. How is the weather today? --_________________________________ 5. What's your favourite subject? --_________________________________ |