You must take good care of the drainage cock of the air control system. Because lead scale formed which might malfunctions the pilot control valve and other instruments.
A. the temperature
B. the rust
C. the pressure
D. the humidity
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总需求的增加会________(提高;降低)实际GDP。总供给的增加会________(提高;降低)价格水平。滞胀是________(经济衰退;经济扩张)和价格水平________(上升;下降)的结合。当实际GDP超过潜在GDP,存在________(通货膨胀;衰退)缺口。当潜在GDP超过实际GDP,存在________(通货膨胀;衰退)缺口。
CO2 extinguishes a fire by
A. a blanket of bubbles formed on the
B. smothering
C. cooling
D. isolating the heat from the fuel
总供给曲线是________。
A. 向上倾斜
B. 向下倾斜
C. 一条垂直线
D. 一条水平线
E. u形线
如果一个政客正在竞选,在竞选中,他暗示要提高税收,使用AD—AS模型,如果该政客实践其竞选政见,对实际GDP会产生什么影响?