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【单选题】
In the specific factors model, a 5% increase in the price of food accompanied by a 10% increase in the price of cloth will cause ________ in the welfare of labor, ________ in the welfare of the fixed factor in the production of food, and ________ in the welfare of the fixed factor in the production of cloth.A.
an ambiguous change; a decrease; an increase
B.
an ambiguous change; an increase; a decrease
C.
an increase; a decrease; an increase
D.
an ambiguous change; an ambiguous change; an ambiguous change
E.
a decrease; an ambiguous change; an ambiguous change
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举一反三
【判断题】制动器调整后,开动机床使主轴以 n 主 =300 m/min 的转速正转,然后把制动手柄置于中间位置,主轴能在 2 — 3 转时间内制动,而开动机床时制动带完全松开,说明制动器的松紧调整得当
A.
正确
B.
错误
【简答题】芒硝在贮存是,最容易发生的变异现象是
【简答题】蓄电池常用的充电模式可分为三种:_____、_____和_____。