问答题

分层斜距是分层在（）上的长度‌

答案：导线

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在边界层内，各种物理量在流动方向的变化远远___于其在厚度方向的变化。

答案：小

单项选择题

Absolute advantage is found by comparing different producers' ______.
A、opportunity costs
B、payments to land, labor, and capital
C、input requirements per unit of output
D、locational and logistical circumstances