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Auto CAD的功能包括二维图形绘制、三维图形绘制和图形编辑。
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Which of the following includes dark lateral sounds?
/l/ is produced with potential air flow around both sides of the tongue. It has two distinctive allophones: clear lateraland dark lateral.
When the lateral sound /l/ appears before a vowel, a dark lateral sound is produced.
动物从饲料中获得热能最经济和最主要来源的物质是（ ）。
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