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炉口微压差控制目的()。

A. 根据炉口烟罩内外压差变化调节喉口的开度，以使烟气量发生变化时通过喉口的气流速度保持不变;
B. 控制喉口烟气速度;
C. 使烟气温度进一步下降。

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150t转炉煤气鼓风机额定转速()r/min;电机额定功率()Kw。;风量()m3/h。

As a promotional experiment, Omega Company distributed four million catalogs. In one of the two versions of the catalog, the description of each item for sale mentioned a "Made by Hand" label. The number of purchases from consumers receiving that catalog was twenty percent greater than the number of purchases from consumers receiving a catalog that did not mention the label. Thus, the mention of the label stimulated sales. Which of the following, if true, could best be used to challenge the conclusion drawn above？

A. Consumers receiving the catalog mentioning the label had previously purchased items from Omega Company by mail but consumers receiving the other catalog had not.
B. Surveys showed that consumers returned purchased items to Omega Company during the promotional campaign at the same rate regardless of which catalog they received.
C. The number of purchases from Omega Company declined substantially after the promotional campaign was completed .
D. Omega Company mailed three times as many catalogs that did not mention the "Made by Hand" label as catalogs that did mention the label.
E. Omega Company sold twenty percent fewer items during the year of the promotional campaign than it had during the previous year.

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All showed that【B9】______sleeping

A. good
B. enough
C. proper
D. inconsistent

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绳夹在使用时，可以一个方向排列，也可以正反两个方向交替排列，有主、副绳时，U型环只能卡（）绳。

A. 主
B. 副
C. 主或副

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炉口微压差控制目的()。

A. 根据炉口烟罩内外压差变化调节喉口的开度，以使烟气量发生变化时通过喉口的气流速度保持不变; B. 控制喉口烟气速度; C. 使烟气温度进一步下降。

150t转炉煤气鼓风机额定转速()r/min;电机额定功率()Kw。;风量()m3/h。

All showed that【B9】______sleeping

绳夹在使用时，可以一个方向排列，也可以正反两个方向交替排列，有主、副绳时，U型环只能卡（）绳。

A. 根据炉口烟罩内外压差变化调节喉口的开度，以使烟气量发生变化时通过喉口的气流速度保持不变;
B. 控制喉口烟气速度;
C. 使烟气温度进一步下降。