碘对比剂不良反应的预防，错误的是（） A.使用非离子型对比剂 B.对比剂冷却到25℃

下列各项，不是阳虚小便异常特点的是（）。

A.尿清而长

B.夜尿频数

C.尿急而痛

D.多尿遗尿

E.尿少浮肿

下列物质能诱导细胞凋亡的是（）。

A.抗癌药

B.IL–2

C.神经生长因子

D.半胱氨酸蛋白酶抑制剂

E.EB病毒

There were two widely divergent influences on the early development of statistical methods. Statistics had a mother who was dedicated to keeping orderly records of governmental units (state and statistics come from the same Latin root, status) and a gentlemanly gambling father who relied on mathematics to increase his skill at playing the odds in games of chance. The influence of the mother on the offspring, statistics, is represented by counting, measuring, describing, tabulating, ordering, and the taking of censuses—all of which led to modem descriptive statistics. From the influence of the father came modem inferentical statistics, which is based squarely on theories of probability.

Descriptive statistics involves tabulating, depicting, and describing collections of data. These data may be either quantitative, such as measures of height, intelligence, or grade level—variables that are characterized by an underlying continuum or the data may represent qualitative variable, such as sex, college major, or personality type.

Large masses of data must generally undergo a process of summarization or reduction before they are comprehensible. Descriptive statistics is tool for describing or summarizing or reducing to comprehensible form the properties of an otherwise unwieldy mass of data.

Inferential statistics is a formalized body of methods for solving another class of problems that present great difficulties for the unaided human mind. This general class of problems characteristically involves attempts to make predictions using a sample of observations. For example, a school superintendent wishes to determine the proportion of children in a large school system who come to school without breakfast, have been vaccinated for flu, or whatever. Having a little knowledge of statistics, the superintendent would know that it is unnecessary and inefficient to question each child; the proportion for the entire district could be estimated fairly accurately from a sample of as few as 100 children. Thus, the purpose of inferential statistics is to predict or estimate characteristics of a population from knowledge of the characteristics of only a sample of the population.

Which of the following might be the best title for this passage（）

A. How to Use Descriptive Statistics

B. Applications of Inferential Statistics

C. The Development and Use of Statistics

D. The Drawbacks of Descriptive and Inferential Statistics

通知具有多种功能，既能“上传”，又可以下达。

游车上升时，井架工要察看并防止（）和（），发现异常及时通知司钻停车。