中心暗点

一个比的前项扩大到原来的3倍，后项缩小到原来的2倍，比值（     ）。

Which of the following statements can be inferred from the passage a. An investor of trading stocks only cares about the fixed assets of companies. b. A buyer of investing stocks is always concerned about the performance of companies. c. Most people keep their investing stocks for a longer period of time. d. All people buy trading stocks and investing stock at the same time.

基带跳频与合成跳频的实现方式有什么不同？

西餐宴会先女士、后男士的上菜原则？

简述法人的含义及其应具备的基本条件。