关于多线程下载说法正确的是(  ). A.
多线程下载一般建议开3--5个线程,线程不要开的过多 B.
多线程下载受真实服务器带宽的影响 C.
多线程加速下载原理是单位时间内抢到服务器的资源多了,更多CPU资源给了你 D.
多线程下载开的线程越多下载越快

单项选择题The French highly value domestic production of traditional French cheese made by high-cost, traditional production methods. According to the specificity rule, the most efficient policy tool to protect this traditional industry would be A. to provide a production subsidy to the domestic firms B. to impose an import tariff on cheeses produced in other countries C. to impose an import ban on cheeses produced in other countries D. to eliminate all barriers on cheese imports since no protectionist policy would be efficient

多项选择题地球的能量体系包括内生能和外生能，下列选项中属于外生能有哪些（ ） A. 太阳能 B. 撞击能 C. 重力能 D. 天体引力能