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[单选题]关于建筑业企业承揽工程,说法正确的有( )。
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[单选题]关于工程总承包企业与工程项目管理企业,说法正确的是( )。
Fillinthegapswith wordsorphrasesgiven inthebox.Changethe form wherenecessary.My job varies between the extremely tedious and the annoyingly busy._________ I think I’m happier during the really busy times; no time to think about how bored I am.
Lakes Superior, Huron, Erie, and Ontario are shared by the United States and Canada, and form part of the _________be- tween the two countries.
关于流体在直管内湍流时摩擦系数的说法,正确的是( )。
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