The Olympic Games are divided into the Summer Olympics123![Xov xwm]()
02SepXov xwmChav dej yog ib qho ntawm peb qhov tseem ceeb hauv chav dej thiab cov khoom siv tseem ceeb rau kev kho kom zoo nkauj hauv chav dej. Lub chav dej ny...
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22SepAaaaaaaaaaBraking resistors are widely used in diesel locomotives, DC electric locomotives and subway vehicles. In the vehicle braking process, some vehicles...
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16SepKoj Paub Ntau npaum li cas Cov Ntsiab Lus Feem Ntau Hauv Kev Kho Kom Zoo Nkauj?Koj Paub Ntau npaum li cas Cov Ntsiab Lus Feem Ntau Hauv Kev Kho Kom Zoo Nkauj? 1. Cov ntsia hlau hlau: feem ntau yog siv hauv pob zeb, hauv av thi...
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