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【多选题】
下列物质属于酰化剂是（ ）A.
羧酸
B.
醛
C.
酯
D.
酰胺
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皮皮学刷刷变学霸
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【单选题】Illegal Immigration A key point in the discussion of illegal immigration (and legal immigration, for that matter) is that many of those who are vehemently opposed to illegal immigration are also oppos...
A.
Legalizing the illegal immigration.
B.
Facilitating the legal immigration.
C.
Building a long fence along the border.
D.
Stationing a huge army defending the border.
【简答题】Photoshop 生成的文件默认的文件格式是以 为扩展名,本课程中作业和考试时的文件格式的扩展名用 。
【简答题】photoshop中,默认保存的文件格式是