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【单选题】
漏电保护装置主要用于A.
防止供电中断
B.
减少线路损耗
C.
防止人生触电事故及漏电火灾事故
拍照语音搜题，微信中搜索"皮皮学"使用
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【简答题】我市某校研究性学习小组在老师指导下，对呼吸作用是否产生二氧化碳进行探究．现请你一同参与： [提出问题]：呼吸作用是否产生二氧化碳？ [设计方案并进行实验]： 小雪：在试管中加入2ml蒸馏水，用一支玻璃导管插入水中吹气，结果未发现明显的现象． 小宁：在试管中加入2ml澄清石灰水，用玻璃导管向试管中的溶液吹气，产生的现象是：______，该反应的化学反应文字表达式（或化学反应式）为：______． [...
【简答题】In Germany, nuclear power has been a repeatedly argued and widely felt issue for decades.
【单选题】婴儿在母亲离开前就表现得很焦虑,母亲离开后非常不安,当母亲回来时,他们表现得非常矛盾,想要接近但同时也扭动反抗。很少自己进行探索,很难被安抚。这类婴儿的依恋类型属于:( )
A.
安全型依恋
B.
矛盾型依恋
C.
混乱型依恋
D.
回避型依恋
【单选题】Grammar mistakes of this kind _____ widely among Chinese students.
A.
have been made
B.
has been made
C.
have made
D.
has made
【单选题】The idea of using HIV for a beneficial purpose has been widely accepted．
A.
Right
B.
Wrong
C.
Not mentioned
【单选题】Martin Goldsmith believes that computer music has not yet been widely accepted because ______.
A.
the technology prevents composers from contacting their listeners.
B.
no great music has yet been created through computer technology.
C.
famous composers refuse to use the new technology to make music
D.
computer is not a terrific instrument for making musical works.
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