[单项选择]Everyone knows hand washing is important. But a new study shows how washing yore" hands (67) , and at the right time, can have a big impact on your family’s risk of getting sick.
Most studies on hand washing focus on (68) and food service workers. But this month’s American Journal of Infection Control focuses on washing hands at (69) as a way to stop infections from (70) Several studies show hands are the single most important (71) route for all types of infections.
Even though most people know to wash their hands after using the toilet or handling a diaper (尿布), studies (72) many people are still ending up with germs on their hands.
One study looked in homes of (73) recently vaccinated against polio (脊髓灰质炎). After vaccination, the virus is (74) to be shed in the baby’s feces (粪便). Researchers found the virus on 13 percent of bathroom, living room and kitchen surfaces. (75)
A. parents
B. teachers
C. adults
D. infants

查看答案

[单项选择]李先生参与了某个投资项目，第一年的投资收益率为15.2%，第二年的投资收益率为7.9％，第三年的投资收益率为－11％。则李先生三年投资的几何平均收益率为（）
A. 3.42%
B. 11.33%
C. 10.63%
D. 3.80%

查看答案

[单项选择]Questions 6 to 10 are based on the following passage:
Human needs seem endless. (78) When a hungry man gets a meal, he begins to think about an overcoat, when a manager gets a new sports car, a big house and pleasure boats dance into view.
The many needs of mankind might be regarded as making up several levels. When there is money enough to satisfy one level of needs, another level appears. The first and most basic level of needs involves food. Once this level is satisfied, the second level of needs, clothing and some sort of shelter, appears. By the end of World War II, these needs were satisfied for a great majority of Americans. Then a third level appeared. It included such items as automobiles and new houses.
By 1957 or 1958 this third level of needs had fairly well been satisfied. Then, in the late 1950s, a fourth level of needs appeared: the "life-enriching" level. (79) While the other levels involve physical satisfaction, that is, the feed in comf
A. were very rich
B. lived in poverty
C. had the good things on the first three levels
D. did not own automobiles

查看答案

[判断题]任一台牵引电动机故障使用电阻制动时,制动电流不应过大。( )
A.正确
B.错误

查看答案

[多选题] 财政部门应当按职责( )举报或者投诉。
A. 受理
B. 调查
C. 处理
D. 公示

查看答案

[判断题]一些国家从社会主义经济制度改变为资本主义经济制度,说明社会主义已不是人类社会的必然规律了。(1..0.分)0..0. 分
A.正确
B.错误

查看答案

[判断题]常温常压下，丙烷和丁烷呈气体状态，而戊烷呈液体状态。

查看答案

[判断题]对易倒塌、怕污损、自带包装薄弱和客户有特殊要求的零散快运货物应入小型箱或使用伸缩膜缠绕加固。（）
A.正确
B.错误

查看答案

[单选题]自翻车的型号标记用( )表示。
A.N
B.X
C.P
D.KF