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【简答题】
若Hg 2+ ，Cd 2+ ，Mn 2+ ，Cu 2+ ，Zn 2+ 的浓度均为0.1mol·dm -3 ，盐酸的浓度均为0.3mol·dm -3 。通入H 2 S时不生成沉淀的离子是______。
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举一反三
【单选题】The income elasticity of demand is the
A.
absolute change in quantity demanded resulting from a one unit increase in income.
B.
percent change in quantity demanded resulting from the absolute increase in income.
C.
percent change in quantity demanded resulting from a one percent increase in income.
D.
percent change in income resulting from a one percent increase in quantity demanded.
E.
percent change in income resulting from a one percent increase in price.
【单选题】The income elasticity of demand is largest for
A.
food.
B.
clothing.
C.
shelter.
D.
luxuries.
【简答题】Income elasticity of demand
【单选题】Assume the price elasticity of demand for tobacco is 0.5, and the income elasticity of demand for tobacco is 0.4. Then:
A.
an increase in the price of tobacco will decrease total revenue from sales of tobacco.
B.
a 20% increase in the price of tobacco will decrease the quantity demanded of tobacco by 8%.
C.
tobacco is an inferior good.
D.
a 50% increase in income will increase the quantity demanded of tobacco by 20%.
【简答题】请利用CNKI高级检索,检索我校林进添老师于2016年至2017年间发表在本校学报的论文;其中发表时间最早的一篇是发表于( )年度、第( )卷、第( )期上。
【单选题】摆动配对是指:
A.
反密码子第一个碱基与密码子第三个碱基配对不严格
B.
反密码子第三个碱基与密码子第一个碱基配对不严格
C.
反密码子第一、二碱基与密码子第三、四碱基配对不严格
D.
反密码子第三、四碱基与密码子第一、二碱基配对不严格
E.
反密码子的三个碱基与密码子的三个碱基配对都不严格
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