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We all understand that learning a foreign language ________ time and efforts.
11个月前
如图,等边△OAB的边长为2,点B在x轴上,点A在双曲线y=K/X(k≠0)上,将△OAB绕点O顺时针旋转α度(0<α<360°),使点A仍落在双曲线y=K/X(k≠0)上,则α的值不可能是( )
1年前
I wonder how many ______ (手术) ORBIS doctors perform during their visit to a poor country.
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1年前
Excuse me, could you tell me ________? [
1年前