设函数f(x)=(x-x^3)/sinπx,则f(x)(A)仅有无穷多个可去间断点 (B)仅有无穷多个无穷间断点 (C)即有无穷多个可去间断点,又有无穷多个无穷间断点(D)有有限个可去间断点,但有无穷多个无
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