以下不属于流行病学特征的是()。 A.群体特征 B.以分布为起点的特征 C.预防为主

题型:单项选择题

问题:

以下不属于流行病学特征的是()。

A.群体特征

B.以分布为起点的特征

C.预防为主的特征

D.对比的特征

E.以治疗疾病为主的特征

考点:环境卫生(医学高级)环境卫生综合练习环境卫生综合练习题库
题型:单项选择题

煤烟型烟雾事件的主要污染物是()

A.SO2和颗粒物

B.NO

C.SO3

D.汽车尾气

E.O3和颗粒物

题型:单项选择题

低承台对承台下桩身摩阻力的影响规律大致为( )。

A.对桩侧阻力有“削弱效应”,对桩端阻力产生“增强效应”

B.对桩侧阻力、桩端阻力均有“削弱效应”

C.对桩侧阻力有“增强效应”,对桩端阻力产生“削弱效应”

D.对桩侧阻力、桩端阻力均有“增强效应”

题型:单项选择题

气虚型产后恶露不绝,宜选用的最佳治法为()

A.补中益气活血

B.补气摄血固冲

C.活血化瘀止血

D.养阴清热止血

E.以上都不是

题型:单项选择题



As always, I am pleased to be here at the National Press Club for my (1) Speech. This is the seventh time I have had the (2) to give this speech, and over the years I have talked about a wide range of issues: (3) , reading, setting high expectations, improving the teaching profession, and (4) the American high school -- to name just a few.
I have just returned from a five-day, (5) tour of schools in rural America. We started in Monroe, Louisiana, and finished (6) later in Paducah, Kentucky. What I noticed most about the trip was the weather. Every time I (7) my Success Express School Bus, the local people who came to greet me (8) that the record for (9) had just been broken in their community. In each place, the temperature was always between (10) degrees.
Now, I have very good people on my staff. But the next time we plan a (11) , I’m going to have a (12) on my staff. I took this bus trip through rural America to make an important point that the (13) of children in our nation’s small towns cannot be ignored. Twenty-five percent of all our school children live in (14) all over America.
When it comes to our children, let’s always remember that children everywhere have (15) and (16) . Yet, schools in small towns too often have to (17) because of limited resources and a (18) . On my trip I put a p focus on the issues that matter in rural America, with a particular emphasis on (19) schools, reducing class size, and overcoming the (20) .

题型:单项选择题

水平管道上进行气体取样,探头应从管道()插入,以避开可能存在的凝液或液滴。

A、底部

B、顶部

C、侧壁

D、侧底部

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