Now select Gradient Tool from the layer palette, make sure that default colors are selected (black and white you can activate them simply by pressing D on your keyboard).
选择渐变工具，保持默认颜色（黑色为前景色，白色为背景色），你可以简单的点击工具栏上面的小图标快速设置。
Then select the layer's content by holding down the Ctrl button and clicking on this layer on the layers panel.
接着，按住ctrl键点击图层面板内的这一图层来选择图层内容。
By means of comparison to different heat insulating materials, man may conveniently select heat insulating materials and determine the most suitable thickness of insulating layer.
通过不同的绝热材料的比较，可以方便地选择绝热材料和确定最适宜保温层厚度。
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