【单选题】三相变压器,原、副边相绕组匝数比为K,当三相绕组Y/△及Y/Y连接时,则原、副边线电压之比分别是______。
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【单选题】三相变压器,原、副边相绕组匝数比为K,当三相绕组Y/△及Y/Y连接时,则原、副边线电压之比分别是______。
【单选题】三相变压器,原副边相绕组匝数比为K,当三相绕组Y/△及Y/Y连接时,则原副边线电压之比分别是 。
【简答题】三相变压器,原、副边相绕组匝数比为K,当三相绕组Y/△及Y/Y连接时,则原、副边线电压之比分别是______。
【单选题】三相变压器,原、副边相绕组匝数比为K,当三相绕组Y/△及Y/Y连接时,则原、副边线电压之比分别是______。
【单选题】与其他动机理论不同,它认为激励个体的原因来自外部,而不是内部。
【单选题】1 6. Two of her brothers were _ __ during the Second World War.
【简答题】用括号中所给单词的适当形式填空 1. During on second, 3______________(baby) were born in the world. 2. At the ______________ (begin) of the twentieth century, the world’s population was about 1,7million. 3. Do you kno...