题目内容

什么是机电传动系统的稳定运行?试分析机电系统稳定运行的充分必要条件?

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写出机电传动方程的表达式,并试述机电传动方程的实际应用意义?

某混凝土实验室配合比1:2.12:4.37,水灰比为0.62,每1m3混凝土水泥用量为290Kg,实测现场砂含水率为3%,石含水率为1%,试求1m³混凝土的施工配合比和各种材料的用量。(写在作业本上拍照上传,注意图片角度及清晰度)

Whose situation is each of the sentences talking about?1. She is not sure if she wants another child.

Anna
B. Stella

Whose situation is each of the sentences talking about?2. She can't stop working to have another child.

Anna
B. Stella

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