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兩定值電阻R1和R2(R1》R2)串聯後接在電壓為U的電源上,功率分別為P1和p2,並立案後接在電壓不變的電源上,功率為P1*和P2*,那麼()
A P1*》P1+P2 B P1*》P1且P1*》P2
C P1*《P1且P1*《P2 D P1*=P1且P1*=P2
大哥大姐會的快來幫下忙吧我急用啊大哥大姐會的快來幫下忙吧我急用啊有沒有人見過是哪裡的中考題告訴下
兩定值電阻R1和R2(R1》R2)串聯後接在電壓為U的電源上,功率分別為P1和p2,並立案後接在電壓不變的電源上,功率為P1*和P2*,那麼()
A P1*》P1+P2 B P1*》P1且P1*》P2
C P1*《P1且P1*《P2 D P1*=P1且P1*=P2
大哥大姐會的快來幫下忙吧我急用啊大哥大姐會的快來幫下忙吧我急用啊有沒有人見過是哪裡的中考題告訴下
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