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【单选题】
已知P0口第0位的位地址是0x90, 将其定义为位变量的正确写法是 。
A.
bit P1_0=0x90
B.
sbit P1_0=0x90
C.
sfr P1_0=0x90
D.
sfr16 P1_0=0x90
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