通航演练 (tōngháng yǎnliàn), passage exercise
通航演练 is the term used in the cited Chinese reports for this encounter. This edition retains “passage exercise” as its English rendering. The completion accounts list communications, formation manoeuvring, replenishment drills and a separation ceremony. The term alone does not establish a general rule about duration, a formal distinction from a combined exercise, or a standing relationship between the navies.