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【单选题】
相同材料制成的两个均匀导体,长度之比为2: 3,横截面面积之比为4: 1,则其电阻之比为( )。A.
12:2
B.
3:8
C.
8:3
D.
2:12
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反馈参考答案：
举一反三
【单选题】Sheila has preferences represented by the utility function U (x; y)=8x + 4y. She consumes 12 units of good x and 3 units of good y. If her consumption of good x is lowered to 10, how many units of y m...
A.
12 units of good y
B.
10 units of good y
C.
7 units of good y
D.
5 units of good y
【单选题】Good X and good Y are substitutes. If the price of good Y increases, then the
A.
demand for good X will decrease.
B.
quantity demanded of good X will decrease.
C.
demand for good X will increase.
D.
quantity demanded of good X will increase.
【简答题】油底壳的主要功用是储存_______并封闭曲轴箱。
【单选题】Doreen has preferences represented by the utility function U(x;y) = 10x+5y. She consumes 10 units of good x and 9 units of good y. If her consumption of good x is lowered to 1, how many units of y mus...
A.
30 units of good y
B.
20 units of good y
C.
27 units of good y
D.
18 units of good y
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