皮皮学，免费搜题
登录
搜题
【单选题】
已知两个关系 ,其中关系 R(A,B,C,D),A是主码;另一个关系 S(I,J,A),I 是主码。对它们正确的描述是:A.
R 关系属性引用 S关系中的 A属性值
B.
A是 S关系的外码，S 是目标关系
C.
关系R是被参照关系
D.
属性S.A不能与属性R.A同域
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
【多选题】课文第6段语句It has long been assumed that it is the result of chemistry in the male body. 你认为按意群断句、翻译最恰当的是
A.
It / has / long been assumed that / it is the result of chemistry / in the male body.
B.
It has / long been assumed / that it is the result / of chemistry / in the male body.
C.
It / has long been assumed / that it is the result of chemistry / in the male body.
D.
它已经被长久地假设了，它是化学的结果，在男性身体里。
E.
长期以来，人们认为这是男性体内的化学组织造成的结果。
F.
这是一个被长久假设的事情：这是男性身体化学因素导致的结果。
【简答题】翻译 For cosmetics companies, the male consumer market in China is very much the “gold mine yet to be excavated”.
【单选题】In the absence of known drugs and other compounds with desired activity , is a valuable approach to discover lead compound.
A.
oganic synthesis
B.
random screening
C.
molecular modeling
D.
clinical observation
【单选题】In the absence of known drugs and other compounds with desired activity, ______ is a valuable approach to discover lead compound.
A.
organic synthesis
B.
random screening
C.
molecular modeling
D.
clinical observation
【单选题】The purpose of cultivation of clinical specimen collected from patient is ____.
A.
Observe the shape of bacteria
B.
Observe biochemical reaction
C.
Isolation of colony
D.
Observation of special structures.
【简答题】翻译下列文字,逐段落翻译,将翻译好的字段放置在英文字段下方。 Firstly, we discuss the perceptional architecture in Greece. The ancient Greek architecture pursued plastic arts, and each building seemed to be a sculpture. They pursue...
【单选题】A 21-year-old woman come to emergency room,she states that for past 2 days she experienced muscle ache, insomnia,diarrhea,sweating and depression mood. The patient have been used heroin 2 years, which...
A.
benzodiazepine
B.
antipsychotic
C.
antidepressant drug
D.
methadone
E.
clinical observation
相关题目：