选择一项:A. drunk drivingB. traffic light crossingC. w

选择一项:A. drunk drivingB. traffic light crossingC. writing a ticketD. speedingE. b

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混凝土的预应力用以抵消荷载引起的拉应力,从而提高结构的承载能力。( )

混凝土的预应力用以抵消荷载引起的拉应力,从而提高结构的承载能力。( )×√

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