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【单选题】
如图所示：下列将尖角转换成平滑曲线点的描述正确的是：（）A.
使用转换点工具单击所需要转换的点，拖拽出现句柄后即可
B.
使用直接选择工具按住“Alt"键进行转换
C.
使用转换点工具按住“Alt"键进行转换
D.
使用路径选择工具按住“Alt"键进行转换
拍照语音搜题，微信中搜索"皮皮学"使用
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参考解析：
知识点：
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C.
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【简答题】平均偏差和标准偏差是用来衡量分析结果的____,当平行测定次数n<20时,常用____偏差来表示。< /div>