以下关于烟道采样的描述,不正确的是(  )。

以下关于烟道采样的描述,不正确的是(  )。

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为研究输油管道的水力特性,用水管作模型实验。已知油管直径为600mm,油的运动黏度为40×10.6m2/s,输油流量为9

为研究输油管道的水力特性,用水管作模型实验。已知油管直径为600mm,油的运动黏度为40×10.6m2/s,输油流量为90L/s,水管直径为50mm,水的运动黏

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At last she left her house and got to the airport,__________

At last she left her house and got to the airport,__________(只看到飞机起飞).

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What does the author say about Cisco in the passage.?

What does the author say about Cisco in the passage.?A.Unlike other companies, i

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