The second stage construction area on the main river bed is formed by the second stage up & downstream transverse cofferdams and the longitudinal con crete cofferdam.
三峡工程二期上、下游横向围堰与混凝上纵向围堰共同形成二期基坑，测绘工作要求很高。
2
The forced transverse vibration tests of a ship propeller shafting with a variety of propeller blades were carried out on a test bed.