题目内容
When a train leaves the station at a speed of 66m/s and whistles at a frequency of 1800Hz, set the sound velocity in the air is 330m/s and the sound frequency you will hear at the station will be ().
查看答案
搜索结果不匹配？点我反馈
更多问题
For a steady flow in the pipe, at one place the cross-sectional area is 0.5 ㎝2 and the speed is 12 ㎝/ s, then at another place where the speed is 4 ㎝/ s, the cross-sectional area is: ()
When using stokes law to measure the viscosity of a fluid, the object used should be :()
If the diameter of a certain blood vessel is doubled, and all else remains unchanged, the blood flow through it becomes () the original value.
The conditions under which Bernoulli's equation applies are ().
微信支付 
支付宝支付