问题：
[多选题]MCS-51的产品8051单片机内部由( )及4个8位的I/O端口P0、P1、P2、P3、串行口等组成。
A、CPU
B、4KB的ROM
C、低128B的RAM和高位的SFR
D、8KB的EPROM
E、两个16位的定时/计数器T0和T1
参考答案：
A@#@B@#@C@#@E
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