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Possible Duplicate:
What is the difference between #include <filename> and #include “filename”?
Difference between writing #import <filename.h> and #import “filename.h” i.e written the file name in angular brackets and quotes?
这可能是个愚蠢的问题。 #import <QuartzCore/QuartzCore.h> 之间有什么区别？和 #import "QuartzCore/QuartzCore.h" ？ (大于/小于与双引号)
它们似乎都有效。