有关尿干化学检测原理,葡萄糖测定用 A.偶氮偶联法 B.马来酐试剂 C.葡萄糖氧化酶

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问题:

有关尿干化学检测原理,葡萄糖测定用

A.偶氮偶联法
B.马来酐试剂
C.葡萄糖氧化酶法
D.多聚电解质离子解离法
E.特异性酯酶法

考点:临床医学检验技术士临床检验士基础知识初级临床医学检验技士基础知识
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如果(2a+2b+1)(2a+2b-1)=63,则a+b的值是(   )

A.4
B.±4
C.8
D.±8
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反映回归直线拟合优度的指标有()。

A.相关系数

B.回归系数

C.样本决定系数

D.回归方程的标准差

E.剩余变差(或残差平方和)

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甲酵母菌进行有氧呼吸,乙酵母菌进行发酵。若它们消耗了等量的葡萄糖,问它们共放出的二氧化碳和吸入的氧气的体积之比是()

A.1:2

B.1:1

C.2:3

D.4:3

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分层采油、注水井下工具要求易加工、易连接、操作简单等。

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Workforce is defined as the total number of people who are available to work and earn incomes. The definition includes everyone who is employed or seeking paid employment, so it includes employers and the self-employed.

Although the size of the workforce depends a great deal on the size of the total population, there are several other influences which also affect it. The age distribution of the total population has a very marked effect on the available workforce. If the population has a high proportion of very young people or of those too old to work, then the available workforce would be lower than if there were an evenly spread age distribution. If the population grows rapidly from natural increase, i.e., the number of births greatly exceeds the number of deaths, then as the total population increases, the proportion in the workforce declines

Sometimes a population is described as aging, which means that the birth rate is either falling or growing very slowly, and as people retire from the workforce, there are not enough young people entering it to replace those who are leaving it. The population is top-heavy with older people. So the percentage of the population in the workforce declines when there is either a rapid increase in births or a falling birth rate.

The age distribution of the population has several important effects on the economy. If the population is aging and there is an increase in the number of people retiring without a corresponding increase in the number entering the workforce, this raises the problem of the ability of the economy to provide a reasonable level of social services to the retired group. If the aged are to be cared for in special homes or hotels, finances must be available for that purpose. If the size of the workforce is small relative to the total population, then the government tax receipts are relatively low and either the government has less money available to it or the workforce members have to be taxed more heavily.

The size of the workforce declines when ().

A. many people reach the retiring age

B. the birth rate falls rapidly

C. the number of retirees exceeds that of new workers

D. the death rate increases

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