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【单选题】
RS-232C标准规定信号“0”和“1”的电平是( )A.
0V和+3～+15V
B.
-3～-15V和0V
C.
-3～15V和+3～+15V
D.
+3～+15V和-3～-15V
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A.
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B.
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C.
It is very important to make yourself not to get dehydrated.
D.
A big bag is not necessary for you.
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