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【判断题】
商代后期的都城都在郑州A.
正确
B.
错误
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举一反三
【单选题】In the high-low method, the change in total cost is due to:
A.
a. fixed cost per unit
B.
b. mixed cost per unit
C.
c. total fixed cost
D.
d. variable cost per unit
【单选题】The marginal product of labor is the change in total product from a one-unit increase in
A.
the quantity of labor employed, holding the quantity of other inputs constant.
B.
the quantity of capital employed, holding the quantity of labor constant.
C.
both the quantity of labor and the quantity of other inputs employed.
D.
the wage rate.
【单选题】Refer to Figure 9-4. The change in total surplus in Nicaragua because of trade is
A.
$625, and this is an increase in total surplus.
B.
$750, and this is an increase in total surplus.
C.
$625, and this is a decrease in total surplus.
D.
$750, and this is a decrease in total surplus.
【单选题】在运动技能形成的巩固阶段，中枢神经系统得主要特征是
A.
脑干易化区与抑制区的活动进一步协调
B.
大脑皮质的兴奋与抑制在时间上和空间上更加集中
C.
大脑与小脑的功能活动进一步平衡
D.
大脑与边缘系统的功能高度配合
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