The three possible QoS values for each topic subscription are 0, 1 and 2.

每一个主题订阅三个可能的qos值为0、1和2。

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Leave the default values for the rest of the fields and proceed by clicking one of the three buttons at the bottom of the screen.

保持其他字段的默认值，单击屏幕底部的三个按钮之一。

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If the type attribute has none of these values, the XPath expressions for the first three type alternatives will evaluate to false.

如果类型属性的值不是这三个值，前三个类型替换的XPath表达式将计算为false。

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But it is the robust values given to the three other buildings in the deal that should provide some comfort and cover for investors and lenders interested in less prominent buildings.

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Rather than remembering each pixel value as an address and three values for red, green, and blue (RGB), a program can check and discover that a whole region of the screen is the same color for the moment and simply say, for all the pixels between these two addresses, set them to these three values.

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