118.已知平行六面体ABCD—A1B1C 1D1中,A1A ⊥平面ABCD,AB=4,AD=2.若B1D⊥BC,直线B1D与平面ABCD所成的角等于30°,求平行六面体ABCD—A1B1C 1D1的体积.
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