口服磺胺类药需多喝水的目的是：
A. 减轻胃肠道刺激
B. 增强药物疗效
C. 维持血液Ph
D. 避免损害血系统
E. 增加药物溶解度，避免结晶析出
已知消费者的收入为50元，Px=5元，Py=4元，假设该消费者计划购买6单位X 和 5单位Y，商品X和Y的边际效用分别为60和30，如要实现效用最大化，他应该
A. 增购X而减少Y的购买量
B. 增购Y而减少X的购买量
C. 同时增加X和Y的购买量
D. 同时减少X和Y的购买量
记账凭证和原始凭证的共同点是（）。
A. 填制的人员相同
B. 填制的时间相同
C. 经济业务内容相同
D. 作用相同
Which of the following is the most accurate description of a value network?
A. a system of partnerships and alliances that a firm creates to source, augment, and deliver its offerings
B. a system of organizations and resources involved in moving a product from supplier to customer
C. an arrangement whereby an organization transforms inputs into finished goods
D. a network that allows an organization take the finished products to the end-users
E. a communication network that allows an organization to transfer information to end-customers
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