【单选题】弱酸性水溶液中的氢离子浓度可表示为( )
【简答题】小王需要在Word文档中将应用了“标题1”样式的所有段落格式调整为“段前、段后各12磅,单倍行距”,最优的操作方法是: A)将每个段落逐一设置为“段前、段后各12磅,单倍行距”。 B)将其中一个段落设置为“段前、段后各12磅,单倍行距”,然后利用格式刷功能将格式复制到其他段落。 C)修改“标题1”样式,将其段落格式设置为“段前、段后各12磅,单倍行距”。 D)利用查找替换功能,将“样式:标题1”替...
【简答题】French fries, ___1___ with a pint of soda, are a favourite part of fast-food lunches and dinners for millions of American youngsters. But taking a cue from health experts, a group of 19 ___2___ are pl...
【简答题】短周期元素形成的纯净物A、B、C、D、E之间的转化关系如图1所示,物质A与物质B之间的反应不在溶液中进行(E可能与A、B两种物质中的某种相同). 请回答下列问题: (1)若C是离子化合物,D是一种强碱,写出C的化学式______. (2)若E是有臭鸡蛋气味的气体硫化氢(其水溶液为二元弱酸),D是既能溶于强酸、又能溶于强碱的化合物. 用等式表示E与NaOH溶液反应后生成正盐的溶液中所有离子浓度之间的...
【简答题】弱酸性水溶液中的氢离子浓度可表示为 (A) 14-pOH; (B) ; (C) 10 pOH-14 ; (D) 10 14-pOH 。
【简答题】My name is Billy Smith. I am 50 years old this year. I was very fat two years ago. _1__(lucky), I managed to lose weight. I began to gain weight when my mum developed Parkinson's disease in 2002. I so...
【简答题】Unit 1-P6 Compare the two paragraphs and point out which makes a better claim and explain . 1. I am against closing the snack bars on the south side of the campus and replacing them with vending machi...