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下列三句话按“三段论”模式排列顺序正确的是( ) ①y=sin x(x∈R )是...
下列三句话按“三段论”模式排列顺序正确的是( )
①y=sin x(x∈R )是三角函数;②三角函数是周期函数;
③y=sin x(x∈R )是周期函数.
A.①②③
B.②①③
C.②③①
D.③②①
考点分析:
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