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在职培训主要是指由本公司举办的培训班或公司以外的培训等各种形式。
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INFRO理论即人生价值取向理论。
The favorite food in the United States is the hamburger, a kind of round sandwich containing grilled beef. A favorite place to buy hamburgers is fast food restaurants. At fast food restaurants, people order their food, wait a few minutes and carry it to their tables themselves. At some fast food restaurants, people can order their food, pay for it and pick it up without leaving their cars. There are many kinds of fast food restaurants in the United States. Most of them sell hamburgers, French fries and milk-shakes, which are traditionally popular foods among Americans. In addition, there are numerous fast food restaurants that serve Chinese food, Mexican food, Italian food, chicken, seafood and ice cream. The idea of the fast food restaurant is so popular that nearly every kind of food can be found in one. How is the idea of the fast food restaurant
为研究接触砷与肺癌的关系，某厂医查阅本单位既往10年职工健康档案资料，比较接触砷和不接触砷者肺癌发生率差别。 对以上资料进行统计分析，最好选用
美国BostonVincent纪念医院妇产科医师Herbst注意到：于1966～1969年间该院诊断了7例年轻女性阴道腺癌病例，这是一种罕见的女性生殖系统癌症，且多发生于50岁以上的妇女中。为详细了解这些病例从胚胎期至发病前的情况，以及她们的母亲在妊娠期的情况，Herbst将1969年 Boston另一所医院发生的一个阴道透明细胞癌的20岁女子也包括在内。这样8个病例，每个病例配4个非该病患者作对照，要求与病例在同等级病房中出生时间前后不超过5天的女婴作为对照候选人，优先选择与病例出生时间最近者为对照。对病例、对照以及她们的母亲进行随访调查。通过对8个病例与32个对照的研究， Herbst等做出结论，母亲在妊娠早期服用己烯雌酚使她们在子宫中的女儿以后发生阴道腺癌的危险性增加。 该研究属于
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