两个排气筒高度分别为20m和25m,排气筒污染物排放速率分别为0.50kg/h和1.50kg/h,则等效排气筒的排放速率

两个排气筒高度分别为20m和25m,排气筒污染物排放速率分别为0.50kg/h和1.50kg/h,则等效排气筒的排放速率为( )。A.1.0kg/h B.1.5

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8 Many People learn English as_______________

8 Many People learn English as_______________A.a second language B.the same lang

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压路机碾压过程中,为防止沥青混合料粘轮现象,可向碾压轮洒少量水或加洗涤液的水,严禁涂刷(  )。 A.柴油B.汽油C.润

压路机碾压过程中,为防止沥青混合料粘轮现象,可向碾压轮洒少量水或加洗涤液的水,严禁涂刷(  )。 A.柴油B.汽油C.润滑油D.煤油

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Paragraphs 4________________

Paragraphs 4________________A.Threat Posed by English B.Definition of a Speech C

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Even in a highly modernized country, manual work is still ne

Even in a highly modernized country, manual work is still needed-A.physical B.me

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