单项选择题
若a=3∠ [图],b=6∠ [图],则a [图]b=________...
A.jiandati.com/96345a2-chaoxing2016-508696.bin"B.jiandati.com/97534c7-chaoxing2016-508697.bin"
C.jiandati.com/6a50037-chaoxing2016-508698.bin"
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