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【单选题】
( 5 )森林资源包括(林地,以及林区范围内的植物和动物)。根据森林的不同效益,将它分为五类:(防护林、用材林、经济林、薪炭林、特殊用途林)。A.
内涵
B.
外延
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皮皮学刷刷变学霸
举一反三
【单选题】Economists believe that oligopolists like American Airlines and the Kellogg Company:
A.
make price and output decisions without regard to what their competitors might do.
B.
have no perceptible influence on the market price, but choose output where marginal revenue equals the marginal cost of production.
C.
carefully watch and anticipate the moves of their competitors.
D.
have no control over market but produce output to the point where demand equal marginal cost.
【简答题】我们每天摄入的营养成分中，构成人体细胞的基本物质是______；人体最主要的供能物质是______；在一般情况下，通常作为储备的能源物质在体内储存的是______．
【单选题】If oligopolists engage in collusion and successfully form a cartel, the market outcome is
A.
the same as if it were served by competitive firms.
B.
efficient because cooperation improves efficiency.
C.
the same as if it were served by a monopoly.
D.
known as a Nash equilibrium.
【单选题】设总体X ~ N(μ1,σ ),Y ~ N(μ2,σ ),且X 与Y 相互独立,X1,...,Xm 为总体X的样本,Y1,...,Yn 为总体Y 的样本,则 服从的分布为( )
A.
χ (m+n)
B.
t(m+n)
C.
F(m,n)
D.
F(m-1,n-1)
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