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【判断题】
工作接地是将电气设备的金属外壳与接地装置之间可靠连接A.
正确
B.
错误
手机使用
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反馈参考答案：
举一反三
【单选题】According to the passage, heroes are compared to high-voltage transformers in that ______.
A.
they have a vision from the mountaintop
B.
they have warm feelings and emotions
C.
they can serve as concrete examples of noble principles
D.
they can make people feel stronger and more confident
【单选题】Focused impeachment articles would not ______ from the power of the charges against Mr. Trump.
A.
distract
B.
disperse
C.
district
D.
detract
【单选题】如何让老版本的Office可以识别Office 07所建立的各种文件?
A.
将文档的扩展名修改为doc:xls:ppt等
B.
安装IE7等工具,使其支持XML格式的文件
C.
运行老版本Office的升级功能进行升级
D.
到微软网站下载 Microsoft Office Word:Excel 和 PowerPoint 07 文件格式兼容包
【单选题】For ideal transformers, a primary input voltage can be transformered to a desired secondary voltage by a suitable choice of ( ).
A.
internal impedance
B.
power factor
C.
turn ratio
D.
excitation impedance
【单选题】— How did you find the film Transformers 3 (变形金刚3)？ — _____. I can't think too highly of it. [ ]
A.
It makes no sense
B.
It's really amazing
C.
It's up to you
D.
By chance.
【简答题】一般将促使物体发生运动的力称为主动力,比如重力。而约束力是在物体有运动或运动趋势的情况下,约束对非自有体的作用力,随主动力的变化而变化,因此约束力是【 】。
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