The relative reliable way is using fixed minor slope Angle of supporting rod or trestle and changing the height of camera to obtain different sample area.
认为比较可靠的方法是使用固定小倾斜角的支竿或支架，用改变高度调节取样面积。
Taking the examination of prestressed pull rod under an arch in a natatorium as a sample, the working internal force of pull rod is determined by use of vibration method.
以某游泳馆拱下预应力拉杆检测为例，应用振动法测试拉杆的工作内力。
One end of a probe telescopic rod is provided with an ultrasonic sensor, a flow velocity determinator, a pressure sensor and a vacuum piston water sample collector.
探头伸缩杆一端安有超声波传感器、流速测定仪、压力传感器和真空活塞水样采集器。
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