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【单选题】
销售收入为20，边际贡献率为60%，其变动成本总额为（)A.
8
B.
12
C.
4
D.
16
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参考解析：
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皮皮学刷刷变学霸
举一反三
【单选题】以下的CSS中,可使所有 元素变为粗体的正确语法是?
A.
p{font-family:bold}
B.
p{font-face:bold}
C.
p{font-weight:bold}
D.
p {text-size:bold}
【单选题】PaCO2升高兴奋呼吸中枢的机制主要是由于
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器
D.
CO2刺激颈动脉体化学感受器
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】PaCO 2 升高兴奋呼吸中枢的机制主要是由于
A.
CO 2 刺激主动脉体化学感受器
B.
CO 2 刺激颈动脉体化学感受器
C.
CO 2 直接刺激延髓中枢化学感受器
D.
CO 2 使脑脊液H + 增加,H + 刺激延髓中枢化学感受器
E.
CO 2 刺激肺牵张感受器
【单选题】PaCO2千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器
D.
CO2刺激颈动脉体化学感受器
E.
CO2刺激主动脉体化学感受器
【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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