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【单选题】
贫血患者选择富含铁的食物时，鸡蛋并非是最好的采源，鸡蛋中铁含量虽多，但吸收率低，因为含有干扰物质A.
抗胰蛋白酶
B.
抗生物素
C.
胆固醇
D.
卵黄高磷蛋白
E.
磷脂
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【单选题】What should we pay attention to when maceration, dissolution, extraction, partition and concentration were used for sample preparation?
A.
Maceration, dissolution and extraction: homogenise the sample as soon as possible to facilitate a uniform and efficient extraction of analytes from the sample matrix prior to partition, beside that a degree of matrix integrity (heterogeneity) needs to be maintained;
B.
C oncentration: The definition and inclusion for essential element are not the same in plant and animal systems. Because the trace elements essential for plants are those elements which cannot be substituted by others in their specific biochemical roles and that have a direct influence on the organism so that it can neither grow nor complete some metabolic cycle.
C.
P artition: transfer of an analyte or analytes from the extractant to the partitioning solvent with high efficiency;
D.
C oncentration: do not reduce the volume of solvent by the application of too much heat, which may lead to some alteration or decomposition of the analyte. It is better to use a lower temperature, at reduced pressure if possible, to expedite rapid solvent removal. Once the solution has been reduced to a small volume, ca. 5 cm 3 , a more prudent method is to direct a stream of dry nitrogen gas onto the surface of the extract.
【简答题】You can tell the age of a tree by counting its rings, but these records of trees' life really say a lot more. Scientists are using tree rings to learn what's being happening on the sun's suce for t...
【单选题】女婴,2个月,已按照计划免疫程序接种过疫苗,家长带其到社区卫生服务中心继续接种。依据免疫接种程序,接种人员工作程序错误的是
A.
查看交费凭证
B.
查验预防接种证
C.
询问婴儿健康状况
D.
告知所接种疫苗作用
E.
进行记录和登记
【单选题】听力原文： Up to about 1915, movies were short and programs were made up of several works. Then, D. U. Griffith and others began to make longer films which provided the same powerful emotional appeal as di...
A.
Films provided more melodrama.
B.
Films provided longer programs.
C.
Films provided emotional appeal.
D.
Films provided greater spectacles.
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