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问题 单项选择题

目前治疗三叉神经痛的方法，疗效最为显著的首选（）。

A.电凝疗法

B.三叉神经感觉根部分切断术

C.卡马西平

D.维生素B12肌注

E.封闭疗法

答案

参考答案：B

解答题

小明家有个长方形晒场，长15米，宽12米，现准备铺上厚4cm的混凝土，算一算，需要混凝土多少立方米？
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单项选择题

Suppose a price-taker firm produces baseball bats that sell at a price of $100 each. This firm’s average total cost at the current level of production is $150 per bat, and the average fixed cost is $40 per bat. Which of the following statements is TRUE regarding this firm They should:（）

A. shut down in the short run because their average total cost is greater than their price.

B. continue producing baseball bats because they are covering their fixed costs.

C. shut down in the short run because their average variable cost is greater than their price.
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