在“对象特性”工具栏中颜色、线型、线宽等特性的默认值为“ ByLayer ”,即随层,为避免特性混乱,通常不做修改。
Goods are carried by several of transport--on road or rail, by sea or air.
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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