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【单选题】
若a、b异号,则下列不等式成立的是( )
A.
ab>0 
B.
<0< /div>
C.
a- b>0
D.
a+b>0
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A.
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【简答题】形成性评价
【判断题】形成性评价是在学习中进行的评价。()
A.
正确
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