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- 4把6V,3W与4V,1W的电灯L1,L2串联在电路中,则L1和L2的最大功率为多少瓦?
- 518墙24墙37墙是怎样砌的?
- 6修路队修一条公路,已修的和未修的比是1:3,又修了300米后,已修的占这条路的2/1,这条路长多少米?
- 7infortian前面加a,an还是the?
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