皮皮学，免费搜题
登录
搜题
【单选题】
Without electricity,what ?A.
will the world be like
B.
would the world be like
C.
the world will be like
D.
the World Would be like
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【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.
【单选题】看了视频2之后你认为是展示的什么外科技术?
A.
腹腔镜胆囊切除术
B.
导航技术下的腹腔镜胆囊切除术
C.
单孔腹腔镜胆囊切除术
D.
经阴道胆囊切除术
E.
NOSES手术
【简答题】局麻药的化学结构可概括为三部分,即{1}、{2}和亲水部分。
【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.
相关题目：