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【判断题】
转子供电式三相并励交流换向器电动机在纺织造纸等工业部门较多。A.
正确
B.
错误
拍照语音搜题，微信中搜索"皮皮学"使用
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皮皮学刷刷变学霸
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【简答题】阅读理解。 If you and your friends wish to share a secret, you can write it in code (编码), and no one else will be able to read it. Codes are one way of writing in secret. Ciphers (暗码) are another. In a cod...
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