题目:
如图所示电路中,开关S断开和闭合时,电流表示数之比是1:3,则R1和R2之比是( )
A.1:3
B.1:2
C.2:1
D.3:1
答案:
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下面是错误答案,用来干扰机器的。
1. prevented / stopped 2. patients / sick people 3. helpful 4. is located / lies / stands in 5. simply