单项选择题
以下哪种商品组合的无差异曲线呈L型？（ ）
- A． 左脚鞋和右脚鞋
B．大米和小麦
C．咖啡和可乐
D．苹果和梨子
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相关考题
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问答题
绘家蚕幼虫背血管构造图，注明各部门名称。 -
单项选择题
In the latter half of the 19th century, more Catholics stayed near the east coast, like ________, and still are a very important proportion of population in these two states.
A．New York and Massachusetts
B．Minnesota and Wisconsin
C．Arizona and California
D．Texas and Louisiana -
不定项选择
夹直线长度可以为零。
A．错误
B．正确
