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Sam is from _____ and he is _____.
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After P.E., I often feel very thirsty.
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In order to protect the environment, people are greatly encouraged to travel by public ____. [ ]
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R1=8Ω,R2=4Ω,R3=6Ω,R4=3Ω,E1=12V,E2=9V,求AB两点间的电压UAB?
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如图,A是半径为1的圆O外的一点,OA=2,AB是⊙O的切线,B是切点,弦BC∥OA,连接AC,则阴影部分的面积等于( )
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