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静息电位形成的离子机制是
A. 膜上离子通道都关闭,无离子跨膜流动
B. K+向膜外扩散的平衡电位
C. Na+向膜内扩散的平衡电位
D. Ca2+向膜内扩散的平衡电位
E. Cl-向膜内扩散的平衡电位
bonded warehouse bill of lading exchange permit air waybill Shipping Instructions Form forwarding agency Consular Invoice term draft Health Certificate goods inward relief system Combined Certificate of Value and Origin A ______, if you had sent the consignment by sea. (passive)
bonded warehouse bill of lading exchange permit air waybill Shipping Instructions Form forwarding agency Consular Invoice term draft Health Certificate goods inward relief system Combined Certificate of Value and Origin If the customs authorities need details of where the goods come from and how they were made, they ______.
计价货币 汇票 银行承兑汇票 支付货币 佣金 银行汇票 本票 远期汇票 商业承兑汇票 即期汇票 跟单汇票 time bill/usance bill.