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【单选题】
人的XXY三体发育成男性，但果蝇的XXY三体则发育为雌性，结合人和果蝇的性染色体组成产生的遗传效应可以判断，人和果蝇性别决定差异在于（）。
A.
人取决于X染色体数目，果蝇取决于Y染色体数目
B.
人取决于是否含X染色体，果蝇取决于X染色体数目
C.
人取决于是否含Y染色体，果蝇取决于X染色体数目
D.
人取决于X染色体数目，果蝇取决于是否含Y染色体
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参考答案：
举一反三
【单选题】Resale Price Maintenance is the name used when a retailer is compelled to sell at a price fixed by the manufacturer instead of choosing for himself how much to add on to the wholesale price he pays fo...
A.
retailers may eventually stop selling their products
B.
it may reduce customers'confidence in their products
C.
customers may feel uneasy when prices vary
D.
it may sometimes lead to poor service
查看完整题目与答案
【判断题】A04. 水果和蔬菜的营养成份相近,可以用吃水果代替吃蔬菜。
A.
正确
B.
错误
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【单选题】When demand is unit elastic price elasticity
A.
exactly equals 1 and total revenue does not change when price changes.
B.
exactly equals 1 and total revenue and price move in opposite directions.
C.
exactly equals 1 and total revenue and price move in the same direction.
D.
approaches infinity and total revenue does not change when price changes.
查看完整题目与答案
【单选题】When the price of a good is
A.
below the equilibrium price, quantity supplied exceeds quantity demanded and price rises
B.
below the equilibrium price, quantity demanded exceeds supplied quantity and price falls
C.
above the equilibrium price, quantity supplied exceeds quantity demanded and price falls
D.
above the equilibrium price, quantity demanded exceeds supplied quantity and price rises
查看完整题目与答案
【简答题】现在有个乒乓球，18个乒乓球盒，每个盒子里最多可以放6只乒乓球，至少有几个乒乓球盒子里的乒乓球数目相同．
查看完整题目与答案
【判断题】水果和蔬菜的营养成份相近，可以用吃水果代替吃蔬菜。
A.
正确
B.
错误
查看完整题目与答案
【单选题】When a price floor is above the equilibrium price,
A.
quantity demanded will exceed quantity supplied.
B.
quantity supplied will exceed quantity demanded.
C.
the market will be in equilibrium.
D.
This is a trick question because price floors generally exist below the equilibrium price.
查看完整题目与答案
【单选题】When the price of a bond is______the equilibrium price, there is an excess demand of bonds and the price will______.
A.
above...rise
B.
above...fall
C.
below...fall
D.
below...rise
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【单选题】商店里有7种乒乓球拍，7种乒乓球和3种乒乓球网出售，马小林要买一块乒乓球拍、一盒乒乓球和l张乒乓球网，他有几种选择的方法（　　）
A.
17
B.
147
C.
lO
D.
21
查看完整题目与答案
【简答题】一只乒乓球重4克，50只乒乓球重______克，100只乒乓球重______克．
查看完整题目与答案
相关题目：
【单选题】Resale Price Maintenance is the name used when a retailer is compelled to sell at a price fixed by the manufacturer instead of choosing for himself how much to add on to the wholesale price he pays fo...
A.
retailers may eventually stop selling their products
B.
it may reduce customers'confidence in their products
C.
customers may feel uneasy when prices vary
D.
it may sometimes lead to poor service
查看完整题目与答案
【判断题】A04. 水果和蔬菜的营养成份相近,可以用吃水果代替吃蔬菜。
A.
正确
B.
错误
查看完整题目与答案
【单选题】When demand is unit elastic price elasticity
A.
exactly equals 1 and total revenue does not change when price changes.
B.
exactly equals 1 and total revenue and price move in opposite directions.
C.
exactly equals 1 and total revenue and price move in the same direction.
D.
approaches infinity and total revenue does not change when price changes.
查看完整题目与答案
【单选题】When the price of a good is
A.
below the equilibrium price, quantity supplied exceeds quantity demanded and price rises
B.
below the equilibrium price, quantity demanded exceeds supplied quantity and price falls
C.
above the equilibrium price, quantity supplied exceeds quantity demanded and price falls
D.
above the equilibrium price, quantity demanded exceeds supplied quantity and price rises
查看完整题目与答案
【简答题】现在有个乒乓球，18个乒乓球盒，每个盒子里最多可以放6只乒乓球，至少有几个乒乓球盒子里的乒乓球数目相同．
查看完整题目与答案
【判断题】水果和蔬菜的营养成份相近，可以用吃水果代替吃蔬菜。
A.
正确
B.
错误
查看完整题目与答案
【单选题】When a price floor is above the equilibrium price,
A.
quantity demanded will exceed quantity supplied.
B.
quantity supplied will exceed quantity demanded.
C.
the market will be in equilibrium.
D.
This is a trick question because price floors generally exist below the equilibrium price.
查看完整题目与答案
【单选题】When the price of a bond is______the equilibrium price, there is an excess demand of bonds and the price will______.
A.
above...rise
B.
above...fall
C.
below...fall
D.
below...rise
查看完整题目与答案
【单选题】商店里有7种乒乓球拍，7种乒乓球和3种乒乓球网出售，马小林要买一块乒乓球拍、一盒乒乓球和l张乒乓球网，他有几种选择的方法（　　）
A.
17
B.
147
C.
lO
D.
21
查看完整题目与答案
【简答题】一只乒乓球重4克，50只乒乓球重______克，100只乒乓球重______克．
查看完整题目与答案
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