A、<span style="font-size:15px;font-family:'微软雅黑','sans-serif'">直接指定颜色特性</span>
B、<span style="font-size:15px;font-family:'微软雅黑','sans-serif'">随层“</span><span style="font-size:15px;font-family:'Tahoma','sans-serif'">ByLayer</span><span style="font-size:15px;font-family:'微软雅黑','sans-serif'">”</span>
C、<span style="font-size:15px;font-family:'微软雅黑','sans-serif'">随块“</span><span style="font-size:15px;font-family:'Tahoma','sans-serif'">ByBlock</span><span style="font-size:15px;font-family:'微软雅黑','sans-serif'">”</span>
D、<span style="font-size:15px;font-family:'微软雅黑','sans-serif'">随机颜色</span>
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