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【单选题】
逆变桥一个桥臂不导通。如果在满功率输出时发生这种故障,则逆变立即失败, ( ) 保护动作。A.
短路
B.
过载
C.
过压
D.
过电流
拍照语音搜题，微信中搜索"皮皮学"使用
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皮皮学刷刷变学霸
举一反三
【简答题】已知函数 ，它的一个极值点是 ． (Ⅰ) 求 的值及 的值域； (Ⅱ)设函数 ，试求函数 的零点的个数．
【多选题】As discussed on the videos, which TWO of the following four options have been shown by research to be generally NOT as effective a method for studying--that is, which two methods are more likely to pr...
A.
deliberate practice
B.
testing yourself
C.
rereading the text
D.
concept mapping
【单选题】Our sadistic science teacher had a strange way of teaching about electrical currents. First, he had us hold hands in a circle. Then he put one student’s hand on a wire with a slight electrical charge.
A.
sad
B.
cruel
C.
rude
D.
arrogant
【多选题】Which of the following options have been shown by research to be generally NOT as effective a method for studying—that is, which methods are more likely to be used by those suffering from illusions of...
A.
Concept mapping
B.
Recall
C.
Testing yourself
D.
Highlighting more than one or so sentence in a paragraph.
E.
Deliberate practice
【简答题】根据短文内容，回答短文后面的问题。 Mr. Zhang is our science teacher. His class is very interesting. We can learn a lot from his class. We like him very much. He often helps us to make things. We make a lot of things. ...
【简答题】函数 的定义域为 ，导函数 的图像如图所示，给出函数 极值的四个命题：①无极大值点，有四个极小值点；②有三个极大值点，两个极小值点；③有两个 极大值点，两个极小值点；④有四个极大值点，无极小值点.其中正确命题的序号是 .
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