Some are tethered to ships, whereas others are cast free to operate like miniature submarines, although these too need the services of a supportvessel.
有一些与船只绑定，另一些则如同微型潜水艇一样自由航行，但也是需要有供给船只服务的。
2
For the internal parts specified in Vessel Standard such as lugs and support rings, corrosion allowance shall conform to the stipulations in it.
容器标准中规定的内件，如耳轴及支撑环的腐蚀余度应符合标准中的规定。
3
Materials for external attachments and vesselsupport welded directly to the pressure retaining parts shall be similar material as the pressure parts.