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【判断题】
短路时由于继电保护装置动作切除故障,短路电流的持续时间很短,近似认为很大的短路电流在很短时间内产生的很大热量全部用来使导体温度升高,不向周围介质散热 , 即短路发热是绝热过程。A.
正确
B.
错误
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举一反三
【单选题】Happiness and success often come to those are good at recognizing their own strengths.
A.
whom
B.
who
C.
what
D.
which
【单选题】Happiness and success often come to those are good at recognizing their own strengths.
A.
where
B.
who
C.
what
D.
which
【简答题】按成本性态，成本总额可分为固定成本和变动成本两大类。
【单选题】Happiness and success often come to those _____ are good at recognizing their own strengths.
A.
what
B.
whom
C.
who
D.
which
【单选题】Inmarsat-C 系统不能提供_____业务。(130270:第3章 Inmarsat-C系统) (A-0,B-0,C-0,D-0,错误-0)
A.
电话 B、电传
B.
E—mail
C.
数据
【简答题】(2013·湖南，21)Happiness and success often come to those________are good at recognizing their own strengths. A．whom B．who C．what D．which
【单选题】Happiness and success often come to those________are good at recognizing their own strengths. (2013·湖南，21)
A.
whom
B.
who
C.
what
D.
which
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