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【多选题】
液压脚制动，有时要二脚或三脚才能制动有效的故障原因是()A.
制动系统漏油
B.
制动系统有空气
C.
制动蹄和制动鼓间隙过大
D.
总泵回油阀关闭不严
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】Deadweight loss measures the
A.
a. loss in a market to buyers and sellers that is not offset by an increase in government revenue.
B.
b. loss in revenue to the government when buyers choose to buy less of the product because of the tax.
C.
c. loss of equity in a market due to government intervention.
D.
d. loss of total revenue to business firms due to the price wedge caused by the tax.
【单选题】The deadweight loss of a tariff:
A.
Is a social loss since it promotes inefficient production
B.
Is a social loss since it reduces the revenue for the government
C.
Is not a social loss because society as a whole doesn't pay for the loss
D.
Is not a social loss since only business firms suffer revenue losses
【单选题】The deadweight loss of a tariff ( )
A.
is a social loss because it reduces the revenue of the government.
B.
is a social loss because it promotes inefficient use of national resources.（社会资源的无效利用）
C.
is not a social loss because it merely redistributes revenue from one sector to another.
D.
is not a social loss bacuase it is paid for by rich corporations.
【单选题】PaCO2增加兴奋呼吸中枢的主要机制是:
A.
CO2直接刺激延髓中枢化学感受器
B.
CO2使脑脊液H+增加，H+刺激延髓中枢化学感受器
C.
H+刺激颈动脉体化学感受
D.
CO2刺激颈动脉体化学感受
E.
CO2刺激主动脉体化学感受器
【单选题】The deadweight loss of a tariff
A.
is a social loss because it promotes inefficient use of national resources.
B.
is a social loss because it reduces the revenue of the government.
C.
is not a social loss because it merely redistributes revenue from one sector to another.
D.
is not a social loss because it is paid for by rich corporations.
E.
is not a social loss because it aids domestic consumers.
【单选题】Deadweight loss measures the
A.
loss in a market to buyers and sellers that is not offset by an increase in government revenue.
B.
loss in revenue to the government when buyers choose to buy less of the product.
C.
loss of efficiency in a market as a result of government intervention.
D.
lost revenue to businesses because of higher prices to consumers from the tax.
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