Bob told you there wasn’t any meeting th_爱下问搜题

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问题选择题

Bob told you there wasn’t any meeting this week, _______?

A．wasn’t there

B．was there

C．didn’t there

D．didn’t he

答案

答案：D

选择题

已知：HCN(aq)与NaOH(aq)反应的△H=-12.1 kJ·mol^-1；HCl(aq)与NaOH(aq)反应的△H=-55.6 kJ·mol^-1。则HCN在水溶液中电离的△H等于 [ ]

A. -67.7 kJ·mol^-1

B. -43.5 kJ·mol^-1

C. +43.5 kJ·mol^-1

D. +67.7 kJ·mol^-1

问答题简答题

为什么说作为集成式菜单系统的超文本具有无序性？