[电大作业] 晶闸管的门极和阴极之间是PN结，其伏安特性称为门极伏安特性。 日期：2021-05-28 10:33:20 点击：137 好评：0
(判断题)19: 晶闸管的门极和阴极之间是PN结，其伏安特性称为门极伏安特性。 A: 错误 B: 正确 ...
[电大作业] 整流电路按电路结构可分为： 日期：2021-05-28 10:32:54 点击：169 好评：0
(多选题)13: 整流电路按电路结构可分为： A: 单拍电路 B: 双拍电路 C: 桥式电路 D: 零式电路 ...
[电大作业] 正弦电路中无功功率和有功功率的平方和等于（）的平方。 日期：2021-05-28 10:32:27 点击：173 好评：0
(单选题)7: 正弦电路中无功功率和有功功率的平方和等于（）的平方。 A: 平均功率 B: 功率因素 C: 视在功率 D: 相移大小 ...
[电大作业] 三相桥式全控整流电路为（）脉波整流电路。 日期：2021-05-28 10:32:00 点击：181 好评：0
(单选题)1: 三相桥式全控整流电路为（）脉波整流电路。 A: 3 B: 4 C: 5 D: 6 ...
[电大作业] This coastal area ________ a national wildlife reserve last 日期：2021-05-28 10:31:01 点击：101 好评：0
(单选题)8: This coastal area ________ a national wildlife reserve last year. A: was named B: named C: is named D: Names ...
[电大作业] These TV sets are different _____ quality and price. 日期：2021-05-28 10:30:21 点击：146 好评：0
(单选题)21: These TV sets are different _____ quality and price. A: to B: with C: from D: in ...
[电大作业] 7. The old woman next door is very keen _____________ growin 日期：2021-05-28 10:29:58 点击：188 好评：0
(单选题)15: 7. The old woman next door is very keen _____________ growing roses. A: at B: on C: with D: to ...
[电大作业] They took ________ measures to prevent poisonous gases from 日期：2021-05-28 10:28:04 点击：183 好评：0
(单选题)4: They took ________ measures to prevent poisonous gases from escaping in the chemical plant. A: fruitful B: beneficial C: effective D: influential ...
[电大作业] I needn't have taken a taxi. I______, it was only a hundred 日期：2021-05-28 10:27:16 点击：102 好评：0
(单选题)17: I needn't have taken a taxi. I______, it was only a hundred meters. A: could walk B: should walk C: could have walked D: ought to walk ...
[电大作业] — Would you like another slice of Christmas cake? 日期：2021-05-28 10:26:48 点击：119 好评：0
(单选题)11: — Would you like another slice of Christmas cake? — _______ I’m full. A: Yes, please. B: No more, thanks. C: Why not? D: Nothing more. ...
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