Is the double bottom block built on pin jigs?

双层底分段是在胎架上造的吗？

Longitudinally-framed double bottom structure.

纵骨架式双底结构。

Double bottom circle book "Qing Emperor Kangxi years."

底双圈内书“大清康熙年制”。

This is a good sign because the market has now made a double bottom "w" pattern.

这是一个好的兆头，因为市场已经作出了双层底“W”的模式。

The main hull girder to consist of upper deck, topside tanks, hopper tanks and double bottom.

主船体梁由上甲板，顶边舱，斜边舱和双层底组成。