The P&P project only started two weeks ago, so the information available is limited.

邮资和包装费项目仅在两周前才开始，因此可用信息有限。

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To start, you can get a list of the available commands by using the -P option (see Listing 1).

首先，您可以通过使用 -P 选项（请参见 清单 1）来获取可用命令列表。

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Keyboard shortcuts: Common Windows keyboard commands, such as Ctrl-S for Save, Ctrl-P for Print, and many others, are also available on the Mac.

快捷键：常见的Windows快捷指令，例如按Ctrl + s进行保存、Ctrl + P进行打印以及其他快捷指令，都同样可以在Mac键盘上实现。

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So if we still have an angle of a 109 . 5 degrees, and again, we still have four unpaired electrons available for bonding, we can make one of those bonds with another s p 3 hybridized carbon, so we're going to make up one pair here.

如果键角仍然是109。,同样，我们还有4个未配对的电子可以用来成键，我们可以用其中的一个,和另外一个sp3杂化碳原子成键，这样我们可以组成一对。

麻省理工公开课 - 化学原理课程节选

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