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【单选题】
关于胎盘功能错误的是（）A.
胎儿，胎盘循环的建立为母胎之间物质交换的基础
B.
足月胎盘的绒毛表面积相当于成人肠道总面积，母儿之间有一个巨大的交换面积
C.
母儿间通过简单扩散进行O、CO交换
D.
胎盘屏障能有效防御有害因素对胎儿的影响
E.
胎盘的合成功能细胞为合体滋养细胞
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举一反三
【单选题】Companies with large scale need a way to reach the savings of the public at large. The same problem, on a smaller scale, faces practically every company trying to develop new products and create new j...
A.
depend on their own financial resources
B.
invite the banks to provide long-term finance
C.
borrow large sums of money from friends and people they know
D.
rely on the population as a whole for finance
【单选题】Economies of scale are reductions in __________ achieved by producing a large volume of a product.
A.
unit cost
B.
marginal cost
C.
failure
D.
total cost
【单选题】Companies with large scale need a way to reach the savings of the public at large. The same problem, with a smaller scale, faces practically every company trying to develop new products and create new...
A.
depend on their own financial resources
B.
invite the banks to provide long-term finance
C.
borrow large sums of money from friends and people they know
D.
rely on the population as a whole for finance
【单选题】Economies of scale refer to cost advantages associated with________ production.
A.
large-scale
B.
mid-scale
C.
long-term
D.
small-scale
【单选题】Companies with large scale need a way to reach the savings of the public at large. The same problem, on a smaller scale, faces practically every company trying to develop new products and create new j...
A.
depend on their own financial resources
B.
invite the banks to provide long-term finance
C.
borrow large sums of money from friends and people they know
D.
rely on the population as a whole for finance
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