multimodal transport refers to a transport system usually operated by one carrier with more than ()transport under the control or ownership of one operator.
A. one mode of
B. two modes of
C. three modes of
D. four modes of
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international multimodal transport
A. 国际铁路运输
B. 国际公路运输
C. 国际海上运输
D. 国际多式联运
land bridge and mini-bridge are a combination of transport by road and rail.
A. 对
B. 错
multimodal transport can not minimize time loss at transshipment points.()
A. 对
B. 错
关于维生素 D的说法,不正确的是( )
A. 维生素 D 能促进钙的吸收,保证骨骼健康
B. 维生素 D 能增加老年人肌肉力量和平衡能力,降低跌倒风险,从而降低骨折发生概率
C. 维生素 D 缺乏可导致继发性甲状旁腺功能亢进
D. 维生素 D 缺乏可增加骨吸收,从而引起或加重骨质疏松
E. 我国成年人推荐维生素 D剂量为400 IU/d