题目内容

没有再生能力的细胞是

A. 鱗状上皮细胞
B. 神经细胞
C. 平滑肌细胞
D. 内皮细胞
E. 骨细胞

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1、Windows7系统正确关机的过程是()

A. 在运行Windows7时直接关机
B. 关闭所有运行程序,选择“开机”-->“关机”命令
C. 先退到DOS系统,再关闭电源
D. 关闭所有任务栏的窗口后,直接断电关机

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

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