Sensors detect when dust concentrations reach a critical level and then an electric charge energises the material sending a dust-repelling wave across its surface.
当传感器发现粉尘浓度达到了临界水平，就有一定的电荷促使该材料发出除尘波越过其表面。
Substantive % procedures are audit procedures designed to detect material misstatements at the assertion level.
实质性程序是指用以发现认定层次重大错报的审计程序。
Tests sof control are audit procedures performed to evaluate the effectiveness of the operation of internal control to prevent, or detect and correct material misstatement at the assertion level.
控制测试是指用于评价内部控制在防止或发现并纠正认定层次重大错报方面的运行有效性的审计程序。
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