在虚拟商务中,企业实现电子商务、进行信息化管理的基础是()。
A.物流管理
B.支付结算
C.交易安全
D.网络技术、数据库技术、网络建设等基础技术
参考答案:D
Firms in a perfectly competitive industry will increase their output until which of the following conditions is met()
A. Total revenue equals price.
B. Marginal cost equals price.
C. Marginal revenue equals average fixed cost.
腹泻患儿。补液后排尿。输液瓶中有余液220ml.最多可加10%或15%氯化钾注射液各多少毫升()
A.4ml2ml
B.5ml3ml
C.9ml6ml
D.6ml4ml
E.7ml3.5ml