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【判断题】
线路距离保护为了防止交流电压回路失压误动，为了反映三相熔断器（空气小开关）同时断开，一般在一相熔断器（空气小开关）旁并联一电容器，使之产生零序电压，电压回路断线闭锁元件动作，闭锁距离保护。这种原理的断线闭锁元件能可靠区分系统故障和电压回路断线。所以得到广泛应用。A.
正确
B.
错误
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举一反三
【单选题】Welfare economics is the study of how
A.
e allocation of resources affects economic well-being.
B.
the allocation of resources affects economic well-being.
C.
price controls work.
D.
the government helps poor people.
E.
to produce greater equality.
【单选题】Welfare economics is the study of
A.
the well-being of less fortunate people.
B.
welfare programs in theUnited States.
C.
the effect of income redistribution on work effort.
D.
how the allocation of resources affects economic well-being.
【简答题】以下属于黄山景观的是() A黄山松 B怪石 C云海 D瀑布
【单选题】Welfare economics is the study of how
A.
the allocation of resources affects economic well-being.
B.
a price ceiling compares to a price floor.
C.
the government helps poor people.
D.
a consumer’s optimal choice affects her demand curve.
【单选题】Welfare economics is the study of
A.
how the allocation of resources affects economic well-being.
B.
taxes and subsidies.
C.
how technology is best put to use in the production of goods and services.
D.
government welfare programs for needy people.
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