中国投资有限责任公司是中国首个中外合资证券公司。 ( )

双人复苏时，正确的是（）

A.挤压心脏的速率为68～80次／分

B.每挤压心脏5次后行人工呼吸1次

C.每挤压心脏15次后行人工呼吸3次

D.每挤压心脏10次后行人工呼吸2次

E.每挤压心脏15次后行人工呼吸2次

某管道安装工程项目。该管道工程属于超高层建筑管道工程，由于施工项目经理部严格执行超高层建筑管道施工的技术要点，使得工程进展非常顺利，施工质量达到各项要求。管道安装完毕后，对其进行了系统试验，试验时的有关实施过程如下：
(1) 采用闪点为40℃的可燃液体介质对管道进行液压试验；
(2) 在进行液压试验时其环境温度为2℃；
(3) 在进行气压试验时，承受内压钢管的试验压力为设计压力的2.15倍；
(4) 泄漏性试验合格后进行真空度试验。

简要说明真空度试验的实施要点

When you stop and think about your high school or college alma mater, were your experiences more positive or negative Do your feelings of (1) in that school have anything to do with whether or not your school was single-sex or coed (2) to send their children to single-sex schools, because they feel both (3) when they study in the company of students of the same sex. They (4) .
For years, only parents who could afford to send their children to private schools, or who had (5) , chose single-sex education for their children. Single-sex schooling was (6) for most American families. Today, however, along with (7) , public schools are experimenting with the idea of (8) .
Girls may be the ones who benefit most from single-sex schooling. Studies have shown that (9) in coed classrooms because teachers sometimes pay more attention to boys. Girls’ (10) toward their studies tends to disappear as they begin to feel less successful. They start to (11) outperform them in math and science. As boys (12) , girls start to lose it. Moreover, adolescence is (13) for girls. As they experience adolescent changes, some girls become depressed, develop an addiction, or suffer from (14) .
In the early 1990s, some influential people said that being in single-sex classes could (15) . Schools across the country began creating single-sex classrooms and schools. But many critics claim that (16) may actually be detrimental to a girl’s education because they (17) of sex differences.
The renewed interest in single-sex schooling (18) among Americans. Those who give it full endorsement believe girls need an all-female environment to take risks and find their own voices. Those who (19) of single-sex schooling wonder whether students’ lack of achievement warrants returning to an educational system that divides the sexes. They believe there is no (20) .

扁桃体周脓肿诊断方法最有价值的是（）。

A.血培养

B.B超

C.脓肿穿刺抽脓

D.咽部X线平片

E.咽部CT或MRl

某永续年金每年向客户支付5000元的股利，如果无风险收益率为4％，则该年金的现值为（）万元。

A.12.5

B.4.17

C.6.25

D.20