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【简答题】
对于电流继电器，动作条件为I r ______；当I r ______时，继电器返回。
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举一反三
【单选题】听力原文： Some of the notebooks George Washington kept as a young man are still in existence. They show that he was learning Latin, was very interested in the basics of good behavior. in society, and was ...
A.
lacked practice in public speaking
B.
felt his education was inadequate
C.
disliked arguing and debating with people
D.
felt the others were impractical
【单选题】From Paragraph 5 the author emphasizes ______.
A.
the danger of viruses
B.
the common existence of virus particles
C.
the short life span of viruses
D.
the difficulty in killing viruses
【单选题】患儿女,4个月健康婴儿,现采用人工喂养,家属到儿保门诊咨询喂养方法。此时护士应指导添加的辅食是
A.
肉末
B.
饼干
C.
含铁丰富的米粉、蛋黄
D.
米饭
E.
馒头
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