【单选题】The strategy in a mature industry to invest in infrastructure that would be cost-prohibitive for new entrants to deter new competition from entering the market is known as:
A.
product proliferation.
【单选题】在某一类型的血细胞中,一种电中性物质的浓度比周围血浆中的该物质的浓度高得多,然而此物质仍能继续不断地进入细胞。该物质进入细胞的这一过程是:()
【单选题】在某一类型的血细胞中,一种中性物质的浓度比周围血浆中的浓度高得多,然而此物质仍能继续不断地进入细胞。该物质进入细胞的这一方式是
【单选题】During a period when new entrants are being attracted to an industry, we would expect that:
A.
economic profits are positive.
B.
as a result, economic profits are falling.
C.
as a result, economic profits are rising.
D.
both (a) and (b) are true.
【简答题】服务创新可以在各个层面进行,并不是每一种服务创新都会涉及服务产品特征或服务流程的改变,但有效的创新一定会改变 。
【多选题】概念模型常用的描述工具包括 __________ 。
【简答题】解释名义利率和有效利率,并说出它们的区别。