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问题 单项选择题

患者，男性，56岁，疑为上消化道出血。做隐血试验前3d，应嘱患者选择的食物是

A．菠菜
B．动物血
C．豆制品
D．香菇
E．牛肉

答案

参考答案：C

解析：隐血试验忌食易造成隐血假阳性的食物，如绿色蔬菜、肉类、动物血及其他含铁丰富的食物或药物。

填空题

《汽车修理共》国家职业标准规定，汽车修理工职业培训，技师不少于（）标准学时。
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单项选择题

Scientific research that involves international collaboration has produced papers of greater influence, as measured by the number of times a paper is cited in subsequent papers, than has research without any collaboration. Papers that result from international collaboration are cited an average of seven times, whereas papers with single authors are cited only three times on average. This difference shows that research projects conducted by international research teams are of greater importance than those conducted by single researchers.
Which one of the following is an assumption on which the argument depends

A．Prolific writers can inflate the number of citations they receive by citing themselves in subsequent papers.

B．It is possible to ascertain whether or not a paper is the product of international collaboration by determining the number of citations it has received.

C．The number of citations a paper receives is a measure of the importance of the research it reports.

D．The collaborative efforts of scientists who are citizens of the same country do not produce papers that are as important as papers that are produced by international collaboration.

E．(E) International research teams tend to be more generously funded than are single researchers.
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