题目内容
Some of traditional trade has shifted to cross-border e-commerce, and goods are delivered by express or mail.
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In cross-border e-commerce, goods delivered by express and mail do not face any troubles in customs clearance, settlement of exchange and tax reimbursement.
From the perspective of transaction modes, B2B was absolutely the dominant mode.
孔板流量计与测速管都是属于定节流面积的流量计,利用变动的( )来反映流量的变化。
根据流体力学原理设计的流量(流速)计中,用于测量大直径气体管路截面上速度分布的是 ,恒压差流量计是,能量损失最大的是。
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