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【多选题】
(多选)如图所示电路中,电源内阻忽略不计。闭合电键,电压表示数为U,电流表示数为I;在滑动变阻器R 1 的滑片P由a端滑到b端的过程中()
A.
U先变大后变小
B.
I先变小后变大
C.
U与I比值先变大后变小
D.
U变化量与I变化量比值等于R 3
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