Compare with the traditional control with the relay, the PLC control lowers the practice cost, enhances the teaching effect, and increases the study efficiency.

与传统的继电器控制比较，PLC控制降低了实习成本，增强了教学效果，提高了学习效率。

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Just as MarketMind says the law of comparative advantage has never been so appropriate, so I say that mass union disruption is a practice that will cost, not save jobs.

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"Medicare reimbursement rates have not kept pace with the cost of practice, " AMA President Dr. Nancy Nielsen told CNN earlier this week.

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This also applies to the cost structure of the practice as such advisors prefer to keep low overhead and not experience the pressure of having to cover a larger bill and therefore maintain high overhead.

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