多项选择题

站在交通工具演变的基础上，研究地理空间对于国家权力影响的理论有（）。

A．网权论
B．陆权论
C．海权论
D．空权论

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多项选择题

梁式桥按承重结构截面不同分为:

A．板梁桥
B．肋梁桥
C．箱梁桥
D．连续梁桥
E．刚构桥

单项选择题

In the specific factors model, a 5% increase in the price of food accompanied by a 5% increase in the price of cloth will cause wages to , the production of cloth to , and the production of food to .
A、increase by more than 5%; increase; remain unchanged
B、increase by 5%; remain unchanged; remain unchanged
C、remain constant; decrease; decrease
D、remain constant; increase; increase