问题
单项选择题
有关临界雷诺数的描述，下列说法错误的是（）。
A、运行时雷诺数低于临界雷诺数时，混油长度随雷诺数的降低而急剧增加。
B、应用临界雷诺数可以判别管道的工作形态，从而选择混油长度的计算公式。
C、临界雷诺数与界面移动距离的平方根成正比。
D、运行时雷诺数高于临界雷诺数时，混油长度随雷诺数的降低增长缓慢。
答案
参考答案：C
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有关临界雷诺数的描述，下列说法错误的是（）。
A、运行时雷诺数低于临界雷诺数时，混油长度随雷诺数的降低而急剧增加。
B、应用临界雷诺数可以判别管道的工作形态，从而选择混油长度的计算公式。
C、临界雷诺数与界面移动距离的平方根成正比。
D、运行时雷诺数高于临界雷诺数时，混油长度随雷诺数的降低增长缓慢。
参考答案：C
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| It was a Sunday afternoon. The weather was very __1__ and nobody was glad to stay at home. Mike decided to go and swim in the river. His brother, little Jim, wanted to go with him. "__2__ him with you, Mike," said their father. "He'll obey you, I think." When they arrived at the river, lots of people __3__ in it. Mike told Jim __4__ on the bank, then he jumped into the water. About an hour later Mike swam to the __6__ with a fish in his hands. Jim was very __5__. He found a bottle and put the fish in it. That evening little Jim did __7__ except (除……之外) watching the fish. Suddenly Mike __8__ Jim crying (哭) in the room. He ran to him and asked, "What happened __9__ you, Jim?" "The fish has died," Jim said in tears (眼泪汪汪). "I thought it was tired, __10__ I brought it out of the bottle and put it on the chair. I only wanted it to have a rest!" | |||
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