You can select certain layers and hit Control+Alt+B to set your work area to the duration of those layers, or if no layers are selected it will reset the work area to the entire comp.
你还可以选择某一层，按Ctrl+Alt+B设定工作区域和这个层一样，如果没有选中层，则工作区域被设定为整个合成的长度。
So, I select the second column of B, and I take the first row of A, 0 and I find: 1 times 0: 0.
所以我用B的第二列和A的第一行，然后我算：1*0
Select the brush Tool (b) right click on the image and select the brush we just made.
选择画笔工具(乙)在图像上点击右键并选择我们刚刚刷了。
You can select either of 3 options, Standard, Art, or B/W, depending on the desired effect and personal taste to make the photo look natural to artistic.
您可以选择3个选项，标准，艺术，或B /瓦，根据预期的效果和个人品味，使照片看起来更自然的艺术。
This article reviews the advances in recent years of whether to, when to, and what drugs to select to give anti-virus therapy to those patients of fulminant hepatitis B and so on.
文中就目前乙型重型肝炎是否行抗病毒治疗，抗病毒治疗的时机、特点以及药物的选择等方面进行了综述。
Select the Layer Mask of a dancer and simply use the Brush Tool (b) set to black, and draw over the part you want to hide.
选择一个舞蹈家图层蒙版，只是用画笔工具(B)设置为黑色，并绘制了部分你要隐藏。
Hit B to select the Brush Tool and make sure the color is pure white.
点击乙选择画笔工具，并确保颜色是纯白色。
Group B campers may select a special activity of interest together with other elective activities.
组的学员可选择一项最有兴趣的活动为主。
Add a mask to this layer (Layer > Layer Mask > Reveal All), select a small black brush tip (B) and paint with it over the shadow from the right side of the paper corner to erase it.
这一层（图层 > 图层蒙版 >显示全部）添加蒙版，选择一个黑色的小笔尖（B）和涂抹它的右侧的纸护角的影子，将其擦除。
B. Customize branch list button Click this button to individually select the specific branches that you want to show.
自订分支清单按钮：按一下此按钮，个别选取您想要显示的特定分支。
Click on the Add a layer mask button at the bottom of the Layers Panel and select the Brush Tool (b).
点击图层面板底部的添加图层蒙版按钮，并选中画笔工具(B)。
The following example is a very simple template file for a wizard that asks the user to select either A or B.
下列范例是一个非常简单的样板档案，其中精灵要求使用者选取A或B。
Finally, it introduces the detail how to determine the main parameters in the brake's design and how to properly select the configuration design and construction type for main components of the b...
并对设计制动器时主要参数的确定和主要件的结构设计与选型作了详细的介绍。
Finally, it introduces the detail how to determine the main parameters in the brake's design and how to properly select the configuration design and construction type for main components of the b...
并对设计制动器时主要参数的确定和主要件的结构设计与选型作了详细的介绍。
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