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【单选题】
关于函数 的连续性、可微性的正确结论是( )．A.
除两个点是第一类间断点外处处连续可导．
B.
f(x)在(-∞，+∞)连续，仅有一个不可导点．
C.
f(x)在(-∞，+∞)连续，仅有两个不可导点．
D.
f(x)处处可导．
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