图5为气流加热装置的示意图,使用电阻丝加热导气管,视变压器为理想变压器,原线圈接入电压有效值恒定的交流电并保持匝数不变,

图5为气流加热装置的示意图,使用电阻丝加热导气管,视变压器为理想变压器,原线圈接入电压有效值恒定的交流电并保持匝数不变,调节触头P,使输出电压有效值由220V降

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They believe that there are transport developments ______ t

They believe that there are transport developments ______ that will bring a lot

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When is the report due?

When is the report due?A.Thursday. B.Friday. C.Next Monday.

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4,13,36,(  ),268

4,13,36,(  ),268A.97 B.81 C.126 D.179

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1,1,2,6,24,(  )

1,1,2,6,24,(  )A.11 B.50 C.80 D.120

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