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【单选题】
One unit of zinc and one unit of copper are needed to produce a unit of brass. The world's supply of zinc and the world's supply of copper are owned by two different monopolists. For simplicity assume that it costs nothing to mine zinc and copper, that no other inputs are needed to produce brass and that the brass industry operates competitively. Then the price of a unit of brass equals the cost of the inputs used to make it. The demand function for brass is q = 900-2 p where p is the price of brass. The zinc and copper monopolists each set a price, believing that the other monopolist will not change his price. What is the equilibrium price of brass?A.
100
B.
200
C.
300
D.
50
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【单选题】有关降压药,用药护理正确的是。
A.
可以自行增减药。
B.
出现头晕眼花，属正常反应。
C.
效果差，可自行撤换药物。
D.
降压越快，效果越好。
E.
改变体位，动作要慢。
【多选题】The second function of the MCU ports is used to implement( ):
A.
output data
B.
read the state of a sensor
C.
counting pulses
D.
external interrupting
【单选题】The second function of the MCU ports is used to implement ( ).
A.
output data
B.
read the state of a sensor
C.
pulses
D.
external interrupting
【单选题】负债率、债务率和偿债率是外债管理的重要内容,以下关于这三者的说法不正确的是( )
A.
负债率是年末外债余额与当年国内生产总值的比率
B.
债务率指年末外债余额与当年国际收支统计口径的货物与服务贸易出口收入的比率
C.
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D.
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【单选题】负债率、债务率和偿债率是外债管理的重要内容,以下关于这三者的说法不正确的是
A.
负债率是指年末外债余额与当年国内生产总值的比率
B.
债务率是指年末外债余额与当年国际收支统计口径的货物与服务贸易出口收入的比率
C.
偿债率是指外债的本金和利息偿还金额与当年国际收支统计口径的货物与服务贸易出口收入的比率
D.
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【单选题】Directional intake ports in diesel engines are used to ————————
A.
reduce air charge turbulence
B.
induce air swirl
C.
deflect hot combustion gas way from the valves
D.
oppose the effects of piston induced squish
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