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【多选题】
下列各种需要中属于社会公共需要的有( )。A.
国防
B.
行政管理
C.
住房需求
D.
基础科学研究
E.
生态环境保护
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【单选题】That most used cars are sold by intermediaries (i.e., used car dealers) provides evidence that these intermediaries
A.
have been afforded special government treatment, since used car dealers do not provide information that is valued by consumers of used cars.
B.
are able to prevent potential competitors from free-riding off the information that they provide.
C.
have failed to solve adverse selection problems in this market because "lemons" continue to be traded.
D.
have solved the moral hazard problem by providing valuable information to their customers.
【单选题】In the nation of Transporta, the income elasticity of demand for used cars is -2.66. So when incomes in this nation increase by 10 percent,
A.
the quantity of used cars demanded will increase by 26.6 percent.
B.
used cars will be normal goods.
C.
the quantity of used cars demanded will decrease by 26.6 percent.
D.
the demand curve for used cars will shift rightward.
【单选题】Despite their varied designs, navigation computers used in cars ______.
A.
are more or less the same price
B.
provide directions in much the same way
C.
work on more or less the same principles
D.
receive instructions from the same satellites
【简答题】As more andmore cars are produced and used, so the _____ from their exhaust-pipes containsan even larger volume of poisonous gas. A. exposure B. distribution C.expansion D. emission
【单选题】下列说法中，正确的是
A.
已知25℃时NH 4 CN水溶液显碱性，则25℃时的电离常数K(NH 3 ·H 2 O)>K(HCN)
B.
25℃时，Mg(OH) 2 固体在20 mL0．01 mol·L -1 氨水中的K sp 比在20 mL0．01 mol·L -1 NH 4 Cl溶液中的K sp 小
C.
pH试纸测得新制氯水的pH为4．5
D.
FeCl 3 溶液和Fe 2 (SO 4 ) 3 溶液加热蒸干、灼烧都得到Fe 2 O 3
【单选题】已知H3PO4的Kθa1= 7.5´10-3、Kθa2= 6.2´10-8、Kθa3= 2.2´10-13；NH3·H2O的Kθb=1.8´10-5。欲配制pH = 7.0的缓冲液，应选用的缓冲对是：
A.
NH 3 ¾ NH 4 Cl
B.
H 3 PO 4 ¾ NaH 2 PO 4
C.
NaH 2 PO 4 ¾ Na 2 HPO 4
D.
Na 2 HPO 4 ¾ Na 3 PO 4
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