Practice certificates: internal control controlled, it will be strong, losed control then weak, not controlled then disorderly.

实践证明：内部控制得控则强、失控则弱、无控则乱。

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The practice certificates that the adding of several measures for anti-interference has strengthened the reliability and continuity of the system.

实践证明，增加了多项抗干扰措施后，加强了系统运行的可靠性和连续性。

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And the practice certificates that this system can meet the needs of multimedia centralized control because of its perfect functions, reliable performances and easy expansion.

实践证明，该系统功能完善、性能可靠、易于扩展，完全能满足多媒体集中控制的需求。

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Many analysts agree that, in the public sector, the practice of reserving jobs has been widely abused: some local officials have even sold fraudulent caste certificates.

ECONOMIST: Job-preferment in India