【简答题】已知:a+b=0,b≠0,则 - a b =______;已知: |a| b =-1 ,则b+|a|=______.
【简答题】已知:A= ,B= ,则A∩B=_________.
【单选题】呈长纺缍形,两端渐细,长5~18cm,表面黄白色至黄棕色,半透明,对光透视,有一条不透明的木心。此药材是
【单选题】— What did she say to you just now? — She asked me if I knew ____. [ ]
【判断题】宋代时认识到脚气病可常服谷白皮汤煮粥来预防。
【单选题】Whose pen is it? It’s____.
【简答题】(1)∵a ∥ b,b ∥ c(已知) ∴______ ∥ ______(______) (2)∵a⊥b,c⊥b(已知) ∴______(______)
【单选题】货币充当商品交换媒介的职能是指货币的( )职能一