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【单选题】
在进行成组设计的两小样本均数比较的假设检验之前,要注意两个前提条件。一要考察各样本是否来自正态分布总体,二是要做()A.
核对数据
B.
作方差齐性检验
C.
求均数、标准差
D.
求两样本的合并方差
E.
作变量变换
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皮皮学刷刷变学霸
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【单选题】口腔颌面部挫伤形成较大血肿时，应进行以下哪一项处理（）
A.
尽早进行热敷，促进血肿吸收或消散
B.
尽早进行理疗，促进血肿吸收或消散
C.
早期切开，建立引流，应用抗生素药物控制感染
D.
无菌条件下，用粗针头将血液抽出，然后加压包扎，应用抗生素药物
E.
直接加压包扎，然后应用抗生素药物控制感染
【单选题】根据材料请回答 31～35 Vegetarian A strict vegetarian is a person who never in his life eats anything derived from(来自于)animals.The main objection to vegetarianism on a long-term basis is the difficulty of gett...
A.
eats the meat of animals only
B.
eats the vegetable only
C.
drinks milks only
D.
eat nothing at all
【简答题】为了执行一条指令，计算机先把它从主存取到________________寄存器，再传送到指令寄存器。
【简答题】设平面薄片所占的闭区域D是由螺线ρ＝2ψ上一段弧(0≤ψ≤π／2)与射线ψ＝π／2所围成，它的面密度为μ(x，y)＝x2＋y2，求这薄片的质量．
【简答题】为了执行一条指令,计算机先把它从主存取到 寄存器,然后再传送到指令寄存器。
【简答题】As very little is known about the life of Shakespeare the writer chose words, phrases, and sentences carefully to support his main idea “Not everybody knows about the life of this remarkable man.” For...
【单选题】What is the main purpose of the speaker?
A.
To introduce his life and Mosquito City.
B.
To ask tourists to go to his hometown for a visit.
C.
To promote biological education among the young people.
D.
To teach us about the plants in his hometown.
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