单项选择题
由费马原理,从相同的起点A经界面返回到相同的终点B的不同路径中,满足反射定律的路径在所有光路中用时最短。
A.true
B.false
由费马原理,从相同的起点A经界面返回到相同的终点B的不同路径中,满足反射定律的路径在所有光路中用时最短。
A.true
B.false
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单项选择题
In the specific factors model, a 0% 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 ________.
In the specific factors model, a 0% 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.increase by less than 5%; increase; decrease