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【单选题】
有一质量均匀分布的圆形薄板,若将其中央挖掉一个小圆,则薄板的余下部分 ( )A.
重力减小,重心随挖下的小圆板移走了
B.
重力和重心都没改变
C.
重力减小,重心位置没有改变
D.
重力减小,重心不存在了
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反馈参考答案：
举一反三
【简答题】简述城市中太阳辐射对园林植物的影响。
【单选题】If the demand schedule may be written P = 100 - 4Q, and the supply schedule P = 40 + 2Q, then the market clearing price and quantity are:
A.
P = 60, Q = 10.
B.
P = 10, Q = 6.
C.
P = 40, Q = 6.
D.
P = 20, Q = 20.
E.
none of the above.
【单选题】Suppose that, at the market clearing price of natural gas, the price elasticity of demand is -1.2 and the price elasticity of supply is 0.6. What will result from a price ceiling that is 10 percent be...
A.
A shortage equal to 1.8 percent of the market clearing quantity
B.
A shortage equal to 0.6 percent of the market clearing quantity
C.
A shortage equal to 18 percent of the market clearing quantity
D.
A shortage equal to 6 percent of the market clearing quantity
E.
More information is needed
【单选题】If the demand schedule may be written P = 100 - 4Q, and the supply schedule P = 40 + 2Q, then the market clearing price and quantity are:
A.
P = 60, Q = 10.
B.
P = 10, Q = 6.
C.
P = 40, Q = 6.
D.
P = 20, Q = 20.
【多选题】Which information is contained in clearing items?
A.
Clearing date
B.
Clearing document number
C.
Archived information
D.
Due date
【简答题】市场出清(market clearing)
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