Steering exposuretime of a camera through control electron shutter with laser echo pulse is an effective method for inhibiting background noise.
用激光回波脉冲控制电子快门来操纵摄像机的曝光时间,是抑制背景噪声的一种有效方法。
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An effective industrial hygiene program must be able to prevent the harmful factors of employee contact immediate response, and long time after exposure in diseases.
During construction and after construction, effective measures should be taken to prevent rain washing and sun exposure, and protective layer should be made in time.