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【单选题】
关于等渗性缺水，以下说法正确的是( )A.
血清钠浓度明显增高
B.
外科临床中较少见
C.
按其在血液中的正常比例丢失
D.
血清钠浓度明显降低
E.
也称慢性缺水
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举一反三
【单选题】Which of the following outcomes is typical of a price ceiling that is set below the market equilibrium price?
A.
Less of the good is produced with the price ceiling than would be produced without it.
B.
The price ceiling has no effect on the market equilibrium.
C.
Consumers can buy more than the market equilibrium quantity because the price ceiling is below the market price.
D.
More of the good is produced with the price ceiling than would be produced without it.
【单选题】A binding price ceiling creates
A.
a shortage
B.
a surplus
C.
an equilibrium
D.
a shortage or surplus depending on whether the price ceiling is set above or below the equilibrium price.
【单选题】If a price ceiling is a binding constraint on the market,
A.
the equilibrium price must be below the price ceiling.
B.
the equilibrium price must be above the price ceiling.
C.
the forces of supply and demand must be in equilibrium.
D.
it will have no effect on supply or demand.
【单选题】If a price ceiling is not binding, then
A.
there will be a surplus in the market.
B.
there will be a shortage in the market.
C.
the market will be less efficient than it would be without the price ceiling.
D.
there will be no effect on the market price or quantity sold.
【单选题】有关超声生物显微镜(UBN)的描述,错误的是( )
A.
它是50Hz的高频率分辨率的B超
B.
用于眼前段的疾病辅助诊断
C.
其因穿通力高可用于眼后节疾病辅助诊断
D.
它对闭角型青光眼、恶性青光眼诊断有意义
E.
有利于对眼前段肿瘤诊断
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