What are the minimum and maximum zoom factors the browsers support?
浏览器支持的缩放因子的最小值和最大值是多少？
Maps Offline Sydney supports three levels of zoom, support for touch move, does not require network.
悉尼离线地图，无须联网，支持三个级别的缩放，支持触摸移动。
Maps Offline Guangzhou supports four levels of zoom, support for touch move, does not require network.
广州离线地图，无须联网，支持四个级别的缩放，支持触摸移动。
Maps Offline Guangzhou supports four levels of zoom, support for touch move, does not require network.
广州离线地图，无须联网，支持四个级别的缩放，支持触摸移动。
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