多项选择题
文献收集可分为如下步骤：（）。
A．根据研究目的筛选有用的文献类型和篇目
B．对有用的内容作标记
C．从文献中摘录某些内容
D．对准备使用的文献进行真伪、可靠程度的鉴别
E．根据研究目的对文献资料进行分类
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相关考题
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多项选择题
根据研究者对访谈结构的控制程度，可分为（）。
A．直接访谈
B．间接访谈
C．结构访谈
D．半结构访谈
E．非结构访谈 -
单项选择题
In the following essay, each blank has four choices. Choose the best answer and write down on the answer sheet. Microwave communication uses(66)-frequency radio waves that travel in straightline sthrough the air. Because the waves cannot(67)with the curvature of the earth, they can be(68)only over short distance. Thus, microwave is a good(69)for sending data between buildings in a city or on a large college campus. For longer distances, the waves must be relayed by means of' dishes' or(70). These can be installed on towers, highbuildings, and mountain tops.A．highB．lowC．longD．short
A.
B.
A．high
B．low
C．long
D．short -
多项选择题
社会工作者面临的几种主要伦理困境是指（）。
A．保守秘密
B．案主自决与家长作风
C．职业界限与个人利益之间的冲突
D．职业价值与个人价值之间的矛盾
E．资源分配时面临的伦理困境
