在其它费用不变的条件下，随着单位存储费用的增加，最优订货批量将相应地增大。（ ）
查看答案
在其它费用不变的条件下，随着单位缺货费用的增加，最优订货批量将相应地减小。（ ）
A. 对
B. 错
当订货数量超过一定值允许价格折扣的情况下，打折条件下的订货批量总是要大于不打折时的订货批量。（ ）
A. 对
B. 错
Which of the following best states the central idea of the passage?
A. China's rail and metro systems have experienced rapid growth from backwardness, and today they greatly help to relieve the pressure of an increasingly large number of travelers due to the rapid economic growth.
B. China's rail and metro systems have experienced rapid growth from backwardness, and today, they boast the highly sophisticated computerized services and the world's most extensive high-speed rail network.
China's rail and metro systems have experienced rapid growth from backwardness, and today they are playing a vital role in the new period of the great rejuvenation of the Chinese nation.
D. China's rail and metro systems have experienced rapid growth from backwardness, and today they serve as the foundation of the continual development within our national transportation sector.
According to the passage, which of the following conditions is the ultimate cause for the beginning of rail service development in China in the late 20th century?
A. Vey basic rail network.
B. People' s limited disposable income.
C. National economic development policy.
D. More people migrating and moving to other towns and cities.
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