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【多选题】
关于膜剂、涂膜剂的正确表述有（）A.
膜剂常用成膜材料有乙烯-醋酸乙烯共聚物（EVA.
B.
与成膜材料PVA05-88相比，PVA17-88的水溶性小、柔韧性差
C.
膜剂常用脱膜剂有液状石蜡等
D.
膜剂的制备方法有匀浆制膜法等
E.
涂膜剂的特点是制备工艺简单，不用裱褙材料
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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】如图是人体部分生理活动示意图，据图回答： （1）图中A系统吸收的营养物质中，______是人体最主要的能源物质．A系统中小肠周围的______（选填静脉或动脉）血管中含营养物质比较丰富． （2）与D相比，E中的______气体增多．D中的氧气由B系统进入循环系统至少穿过______层细胞． （3）通过C系统排除的代谢废物主要是由全身的______产生，并通过循环系统运输而来．尿液的形成过程主要包括...
【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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