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【简答题】
简述图 a 所示升压斩波电路的基本工作原理。
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举一反三
【单选题】以下某教师对7~9年级口语交际和综合性学习教学目标的认识,错误的一项是()。
A.
讲述见闻,完整准确、突出要点。复述转述,内容具体、语言生动。能就适当的话题作即席讲话和即兴演讲
B.
讨论问题,能积极发表自己的看法,有中心、有根据、有条理。能听出讨论的焦点,并能有针对性地发表意见
C.
能从书刊或其他媒体中获取有关资料,讨论分析问题,独立或合作写出简单的研究报告
D.
掌握查找资料、引用资料的基本方法,分清原始资料与间接资料的主要差别,学会注明所援引资料的出处
【单选题】Please choose the better one: (according to the principle of Correctness)
A.
This product is absolutely the best on the market.
B.
This product is the best one we can supply.
【单选题】Please choose the more formal one.
A.
be full of
B.
be overflowing with
【单选题】Please choose the more formal one.
A.
ruminate about
B.
be deep in thought
【单选题】Please choose the more formal one.
A.
refrain from
B.
don't
【简答题】Of all living creatures on earth, insects are the most plentiful. Some  36  are very useful to man,Of all living creatures on earth, insects are the most plentiful. Some 36 ____ are very useful to man...
【简答题】根据文章内容,判断下列句子正(T) 误 (F)。 It's different between western countries and eastern countries about how to keep healthy. Traditional Chinese doctors believe we need a balance of cool yin and hot yang to be ...
【简答题】无线电波有四种,分别是中波、短波、超短波和微波.其中关于微波叙述正确的是().A. 沿地面传播,绕射能力强,适用于广播和海上通信 B. 具有较强的电离层反射能力,适用于环球通信 C. 具有极高频率的电磁波,波长很短,主要是直线传播,也可以从物体上得到反 D. 和超短波一样饶射能力都很好,但不可作为视距或超视距
【单选题】America is now troubled with financial problems, and the same is true _______ some European countries. [     ]
A.
about
B.
of
C.
in
D.
with
【单选题】For _____ homeless, private medical care is simply out of _____ question in some developing countries. [     ]
A.
the / the
B.
the / X
C.
X / X
D.
X / the
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