问答题
裂纹扩展的动力是物体内储存的___________ 的降低大于等于由于开裂形成两个新表面所需的_________ 。
裂纹扩展的动力是物体内储存的___________ 的降低大于等于由于开裂形成两个新表面所需的_________ 。
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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