题目内容

中文Windows7的桌面指的是()

A. 整个屏幕
B. 某个窗口
C. 全部窗口
D. 活动窗口

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Read and complete the sentences with the words and phrases from Passage A.1. As we have learned, these greenhouse gases ___ energy in the atmosphere and make the Earth warmer.2. You'll be able to restart it quickly, and it'll take less energy than shutting it down and then it.3. Planting trees is fun and a great way to _ greenhouse gases.4. When you do the recycling, you send less_ to the landfill and you help save natural ____ , like wood, oil, and metal.

在( )时完全竞争厂商处于短期均衡。

AC=MC
B. P=AC
C. P=MR
D. P=MC

在一般情况下,完全竞争厂商面临的市场价格若低于()就停止营业。

A. 平均成本
B. 平均可变成本
C. 边际成本
D. 平均固定成本

如果一个厂商追求利润最大化,那么它不会在亏损状态维持运营。

A. 对
B. 错