Just as an iceberg which has a visible section above the waterline and a larger invisible section below the waterline, culture has some aspects that are observable and others that can only be suspected and imagined.

108. Apparent wind speed blowing across a vessel under tow can be measured by a(n) ______.

Stability is determined principally by the location of two points in a vessel: the center of buoyancy and the（）.

In the process of reservoir development, a certain oil well stops production while other oil wells around it continue to produce stably. After a long period of time, the measured pressure at the middle depth of the oil layer of the oil well measured is called (). A: Original formation pressure B: Formation pressure C: Current formation pressure D: Static pressure

part program refers to__________.