【单选题】【消耗次数：1】
下列有关AutoCAD中用户坐标系与世界坐标系的描述正确的是（ ）
①
用户坐标系与世界坐标系两者都是固定的
②
用户坐标系固定，世界坐标系不固定
③
用户坐标系不固定，世界坐标系固定
④
用户坐标系与世界坐标系两者都不固定
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