题目内容

如下图所示，水流由水平放置的90°弯管流出，流量为Q，流速为υ，液体密度为ρ，水流对弯头的作用力()。

A. Rx＞ρQυ，Ry＞ρQυ
B. Rx=ρQυ，Ry＞ρQυ
C. Rx＞ρQυ，Ry=ρQυ
D. Rx=ρQυ，Ry=ρQυ

查看答案

搜索结果不匹配？点我反馈

更多问题

以下叙述正确的为()。

A. 系统误差呈正态分面
B. 系统误差又称可测误差
C. 系统误差包括操作误差
D. 方法误差属于系统误差

下列关于岩石的渗透系数的说法错误的为()。

A. 渗透系数主要取决于岩石的性质
B. 渗透系数是反映岩石渗透性能的指标，其物理意义为当水力坡度为1时的地下水流速
C. 岩石的孔隙性好，则渗透系数小
D. 岩石的孔隙性好，则渗透系数大

如下图所示。如果有三台同型号水泵关联工作，当供水量为QA时(Q1＜QA＜Q3)，在运行中考虑定速泵与调速泵相结合，但定速泵与调速台数的确定时，要根据具体情况来考虑，当Q1＜QA＜Q2且QA接近Q2时，应开()泵；当Q1＜QA＜Q2且QA接近Q1时，应开()泵。

A. 一定两调；两定一调
B. 两台定速；一定一调
C. 两台调速；一定两调
D. 一定一调；两台调速

Read the article below about educational background of successful managers.
Choose the best word to fill each gap, from A, B, C or D.
For each question 19—33 mark one letter (A, B, C or D) on your Answer Sheet.
There is an example at the beginning.
Educational Background of Successful Managers
Psychologist Douglas Bray and Ann Howard have for more than 25 years been studying college graduates in entry-level management ranks for AT&T. Here are some of their findings.
Master's degree can be…19… Howard says of Master's degree holders, " They bring us greater...20…and interpersonal skills and more motivation for…21…and money, but they are not any
smarter. " This applied equally to…22…of an MA, MS, and MBA.
There are key…23…between technical and non-technical majors. Business majors led the pack in organizing, planning, and decision-making skills…24…and social science graduates also…25...high. Math, science, and engineering majors scored much lower in these skills. Technical majors did have …26…general mental ability, but they were not as…27…or as good at interpersonal skills. As you might expect, social science majors were quite low on…28…skills. Business majors were the ones most eager to get ahead.
For the future managers, AT&T is still looking for about a third each of business, technical, and liberal arts majors. While they are still looking for master's degrees, some firms say that the…29…of the MBA has passed. Many companies…30…the same management training programs for their new people, whether or not they have a master's degree.
…31…the success/failure studies of managers, educational background is probably less important
than…32…skill that people develop. As one president of a large company puts it, " We're really looking for a particular kind of…33…rather than a particular degree. "
(19)

A. useful
B. helpful
C. successful
D. beneficial