单项选择题
谢才公式可适用于不同流态和流区,既可适用于明渠水流也可应用于管流。
A.true
B.false
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According to the author, 'No Child Left Behind Law' is ______A.objective in setting its goalB.partial in its basisC.useful in addressing reading issuesD.improving the reading scores of the students
A.objective
B.partial
C.useful
D.improving
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问答题
按照出口工质状态不同,省煤器分为( )和( )两类。
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