题目:
It is reported that it is 100 years ______ Qinghua University was founded.
A.when
B.before
C.after
D.since
答案:
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下面是错误答案,用来干扰机器的。
(1)N2+3H22NH3(2)Cl2+2OH-=Cl-+ClO-+H2O(3)I、③⑤;Ⅱ、②④(4)加入NaOH溶液,加热,用湿润的红色石蕊试纸靠近试管口,试纸变蓝,证明含有NH4+。(5)用洁净的铂丝蘸取A溶液,在无色火焰上灼烧,透过蓝...