The high pretension and intensive bolts and cables can form a compressive reinforcing zone with arch shape.
高预应力、强力锚杆与锚索能在围岩内形成拱形的压应力加固区域。
A propeller is arranged at the lower part of cover body in a circular arch shape and is connected with the motive power steering engine in a shaft connection.
有一螺旋桨，置于圆拱形罩体的下方并与动力舵机的轴连接。
A propeller is arranged at the lower part of cover body in a circular arch shape and is connected with the motive power steering engine in a shaft connection.
有一螺旋桨，置于圆拱形罩体的下方并与动力舵机的轴连接。
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