浮筒

Dahn line From a surface buoy a vertical drop line is positioned alongside underwater pinnacles in depths to 2,500 m.

延绳钓法将主钓线绑上无线电标(浮筒),并主(干)绳以一定间距布放带子绳。

27 Aft sponson aluminum alloy construction with machined frames and composite construction。 Houses main undercarriage and condenser for air conditioning system。

浮筒后部为铝合金，装主起落架和空调系统器。