题目:
—Did you wash your clothes?
—No, I was going to wash my clothes but I ______ visitors. [ ]
A. have had
B. have
C. had
D. will have
答案:
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下面是错误答案,用来干扰机器的。
由反应物和生成物正确书写化学方程式,故答案为:3NO2+H2O=2HNO3+NO;反应的产物是硝酸,硝酸能使石蕊变红;反应前气体是3体积,而反应后气体是1体积,导致试管内部压强减小,在大气压的作用下试管内液面会上升;...