皮皮学，免费搜题
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【单选题】
交感神经兴奋引起心率加快，由下列哪种受体介导?A.
α 1 肾上腺素能受体
B.
α 2 肾上腺素能受体
C.
β 1 肾上腺素能受体
D.
β 2 肾上腺素能受体
E.
M胆碱能受体
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参考解析：
知识点：
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【单选题】在Windows 7中，当一个已存文档（如用记事本新建的txt文本文档）被关闭后，该文档将____。
A.
保存在外存中
B.
保存在内存中
C.
保存在剪贴板中
D.
保存在回收站中
【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】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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