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【简答题】
正弦交流电的三要素是什么?各表示什么意义?
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皮皮学刷刷变学霸
举一反三
【单选题】A What is your favorite color? Do you like yellow, orange, or red? If you do, you must be an active person who enjoys life. Do you like blue? Then you are probably quiet, shy, and would rather follow ...
A.
yellow, orange, or red
B.
yellow, black, or red
C.
orange, blue, or black
D.
black, red, or orange