到美国居民家庭访问过的人都知道,许多家庭都有两套炊具,一套用电,另一套用燃气;电力便宜时用电,电贵时用燃气;在用分时电价的地方,白天用燃气,晚上用电。其实在美国不仅居民家庭有这种现象,在所有的电力用户都采用这种机制。这就是说现代化的电力工业其基本特征其实就是能够在 Everyone who visits a U.S. resident family knows that many families have two cookware sets, one for electricity and the other for gas, electricity when electricity is cheap, gas when electricity is expensive, and where daylight-saving electricity is used, daytime With gas, electricity at night. In fact, not only the resident families in the United States have such a phenomenon, this mechanism is adopted by all power users. This means that the basic characteristics of the modern electric power industry are in fact capable of