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加料过程中发现料罐蓬料如何处理？

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JT-C系列机车信号记录器对于辅助信息传输的接口是（）

A. RS-485
B. 8251串
C. RS-232
D. RS-422

Which of the following is a typical data warehouse query?（）

A. What is this customers address?
B. Does this customer have any unpaid bills?
C. What is the balance in this customers account?
D. What are the total sales for each of the last 6 months?

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简述养老保险及其特征。

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试述离婚与无效婚的区别。

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