A___________ is a computer hacker who carries out illegal malicious hacking work.
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__________ are instructions that are hidden within a computer program and are designed to cause faults or destroy data.
A __________is a piece of computer software which enables a website you have visited to recognize you if you visit it again.
下列关于变压器空载试验说法错误的是
A. 通过变压器空载试验可以求出变比
B. 通过变压器空载试验可以求出励磁阻抗
C. 空载试验时,铁心中的涡流和磁滞损耗都是正常运行时的大小
D. 空载试验时,有功功率损耗主要是一次绕组的铜耗
下列关于变压器短路试验说法错误的是
A. 短路试验时,绕组中流过的是额定值
B. 短路试验时,铜损耗等于额定负载时的损耗
C. 铁损耗与铜损耗相比可以忽略不计
D. 通过短路试验,不可以求短路阻抗