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【单选题】
When the price of x rises, Marvin responds by changing his demand for x. The substitution effect is the part of this change that represents his change in demand:A.
holding the prices of substitutes constant
B.
if he is allowed to substitute as much x for y as he wishes
C.
if his money income is held constant when the price of x changes
D.
none of the above.
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举一反三
【单选题】It is not import ___________other people think about you. Believe in yourself.
A.
what
B.
when
C.
why
D.
whether
【简答题】Java语言提供了【 】工具来管理组件在容器中的布局，而不使用直接设置组件位置和大小的方式。