糖尿病的形成有多种原因,如下图所示①、②、③表示由三种机体免疫异常引起的糖尿病。请据

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问题:

糖尿病的形成有多种原因,如下图所示①、②、③表示由三种机体免疫异常引起的糖尿病。请据图回答下列问题:

图中由()产生的抗体Y1与胰岛B细胞上的受体结合,导致()对葡萄糖的敏感度降低,胰岛素的分泌量减少,血糖浓度升高。

考点:高中生物人和高等动物的体液调节人和高等动物的体液调节题库
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混砂系统的作用是将输入的()和支撑剂按一定比例混合搅拌均匀,再由输砂泵供给各压裂车.

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简述在Word编辑窗口中,新建一个文书文件的过程。

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根据《水工混凝土施工规范》有关规定,混凝土坝坝体浇筑块高度一般在( )m以内。

A.1
B.2
C.3
D.4

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Most people would be (1) by the high quality of medicine (2) to most Americans. There is a lot of specialization, a great deal of (3) to the individual, a (4) amount of advanced technical equipment, and (5) effort not to make mistakes because of the financial risk which doctors and hospitals must (6) in the courts if they (7) things badly.

But the Americans are in a mess. The problem is the way in (8) health care is organized and (9) . (10) to pubic belief it is not just a free competition system. The private system has been joined a large public system, because private care was simply not (11) the less fortunate and the elderly.

But even with this huge public part of the system, (12) this year will eat up 84.5 billion dollars—more than 10 percent of the U. S. Budget—large number of Americans are left (13) . These include about half the 11 million unemployed and those who fail to meet the strict limits (14) income fixed by a government trying to make savings where it can.

The basic problem, however, is that there is no central control (15) the health system. There is no (16) to what doctors and hospitals charge for their services, other than what the public is able to pay. The number of doctors has shot up and prices have climbed. When faced with toothache, a sick child, or a heart attack, all the unfortunate persons concerned can do is (17) up. Two thirds of the population (18) covered by medical insurance. Doctors charge as much as they want (19) that the insurance company will pay the bill.

The rising cost of medicine in the U. S. A. is among the most worrying problems facing the country. In 1981 the country’s health bill climbed 15.9 percent--about twice as fast as prices (20) general.

19()

A. knowing

B. to know

C. they know

D. known

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硝酸甘油不扩张下列哪类血管

A.小动脉

B.小静脉

C.冠状动脉的小阻力血管

D.冠状动脉的侧支血管

E.冠状动脉的输送血管

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