下述哪种物质不能使食管下端括约肌(LES)舒张()
A. 促胰液素
B. 前列腺素E
C. 促胃液素
D. 胰高血糖素
E. 血管活性肠肽
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孕产期保健指导重点进行个人卫生和心理的指导。
A. 正确
B. 错误
现代礼仪是经过人类几千年的生活实践,由传统礼仪逐步改进和发展起来的,因此现代礼仪与传统礼仪既有其共同之处,也有着()的差异。
()means a document which evidences a contract of carriage by sea and the taking over or loading of the goods by the carrier,and by which the carrier under takes to deliver the goods against surround of the document.
A. Bill of lading
Bill of exchange
C. Mate's receipt
D. Manifest