A large volume of water is gushing through a pipe which narrows at the outlet. At which point, A, B, C, or D will the water flow

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问题 A large volume of water is gushing through a pipe which narrows at the outlet. At which point, A, B, C, or D will the water flow fastest?

选项 A、 
B、 
C、 
D、 

答案C

解析 (水流在水管最狭窄的地方速度最快。)
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