问题
单项选择题
突然完全关闭管道末端的阀门,产生直接水击。已知水击波速c=1000m/s,水击压强水头H=250m,则管道中原来的流速v0为()
A、1.54m
B、2.0m
C、2.45m
D、3.22m
答案
参考答案:C
突然完全关闭管道末端的阀门,产生直接水击。已知水击波速c=1000m/s,水击压强水头H=250m,则管道中原来的流速v0为()
A、1.54m
B、2.0m
C、2.45m
D、3.22m
参考答案:C
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根据上面的表格用一个或两个词完成下面句子。 1. If you go to , maybe some people can understand you. 2. Egyptians speak . 3. If you go to , you must learn Russian well. 4. The capital of Singapore is . 5. From the form (表格), we can see that is the most important language. |