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After John had been in London for three years, he and his wife had a lot to tell ________.
1年前
如图所示,某同学在探究凸透镜成像规律的实验中,将焦距f =10cm的凸透镜固定在光具座上50cm处,将光屏向________
1年前
6.5m3=______dm3 ; 53mL=______L; 5700cm3=______dm3; 2.4L=______mL; 15时=______日; 600g=______kg.
1年前
1年前
6元=________角 8角=________分 50分=________角 20角=________元
1年前