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【单选题】
二次谐波制动的变压器纵差动保护中设置差动速断保护的主要原因是()A.
为了提高差动保护的动作速度
B.
为了防止在区内故障较高的短路水平时，由于电流互感器的饱和产生谐波量增加，导致比率差动保护拒动
C.
保护设置双重化，互为备用
D.
为了提高差动保护的可靠性
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【简答题】根据短文内容及首字母提示，填写所缺单词。 Many people in Beijing have returned to school only because they have become parents. Parents are searching for help to solve a problem: the education of their 'only c 1 '. One st...
【简答题】From
19 to 1658 England was called a Commonwealth. It was ruled first by Oliver
Cromwell as _______.A. Lord Protector B. Lieutenant General C. Commander of the New Model Army D. President
【单选题】Demeter is believed to bring mankind harvest and _______.
A.
happiness
B.
love
C.
crops
D.
foods
【简答题】通读下面短文，掌握其大意，然后从短文后面的括号内选出可以填入短文空格处的词。 Peter is a famous writer now. But he was not a 1______ student when he was young. He was often late for 2______ and didn't like doing his homework. Sometimes, he...
【单选题】Demeter’s daughter Persephone was kidnapped by ______.
A.
Hades
B.
Zeus
C.
Poseidon
D.
Ares
【单选题】From 1649 to 1658 England was called a Commonwealth. It was ruled first by Oliver Cromwell as _______.
A.
Lord Protector
B.
Lieutenant General
C.
Commander of the New Model Army
D.
President
【简答题】SQL Server的约束包括 primary key 约束、 default 约束、 foreign key 约束、 和 。
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