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c6748 starterware 库 usblib.h中的注释不明白

stareware 库的usblib.h文件的注释中出现的

//! The standard USB request header as defined in section 9.3 of the USB 2.0
//! specification.

和// Definitions related to USB descriptors (sections 9.5 & 9.6)

中的section 9.3 of USB2.0 specation  和 USB descriptors (sections 9.5 & 9.6) 指的是什么,在哪里?

没看明白,求解。

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