【单选题】抗原抗体反应一般在PH值( )反应溶液中进行
【简答题】在△ABC中,A=120°,a= 21 ,S △ABC = 3 ,求b,c.
【简答题】在△ABC中,A=120°,c>b,a= 21 ,且△ABC的面积S △ABC = 3 .求b,c.
【单选题】断面有点状维管束排列成2-4轮同心环的饮片是()
【单选题】The teacher ______from her custom and gave us no homework yesterday.
【单选题】断面有点状维管束排列成2~4轮同心环的饮片是
【单选题】That day the teacher ____ from her custom and gave out no homework.
【单选题】You have no homework to do this evening. How about _____ a walk with me? [ ]
【单选题】Today we have no homework _______.
【单选题】Today we have no homework _______.