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【多选题】
色谱鉴别法包括( )。A.
薄层色谱法
B.
高效液相色谱法
C.
气相色谱法
D.
纸色谱法
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反馈参考答案：
举一反三
【单选题】When the marginal utility of a good is zero, this implies that
A.
a consumer would not spend any additional income to buy more of that good.
B.
consumption of additional units would have positive marginal utility.
C.
total utility is minimized.
D.
total utility is also zero.
【单选题】Marginal profit equals average profit when:
A.
marginal profit is maximized.
B.
average profit is maximized.
C.
marginal profit equals marginal cost.
D.
the profit minimizing output is produced.
【单选题】When marginal revenue is positive,
A.
demand is elastic
B.
marginal revenue is greater than price
C.
decreasing price will decrease total revenue
D.
all of the above
【判断题】函数在某点可导,则在该点一定连续 2、函数在某点连续,则在该点一定可导 3、函数在某点不连续,则在该点一定不可导 4、极值点一定是稳定点 5、稳定点一定是极值点 6、极大值一定大于极小值 7、极值可以在区间端点处取到 8、函数在某点导数大于0,则这一点的倾斜角是锐角
A.
正确
B.
错误
【单选题】Resource use is efficient when production is such that marginal social benefit is
A.
greater than marginal social cost.
B.
equal to marginal social cost.
C.
less than marginal social cost.
D.
at its maximum value.
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