55. Water in the air cooler should be drained periodically as well.
A、
A、Waterintheaircoolershouldbedrainedcompletely.;
B、
B、Waterintheaircoolershouldbereserved.;
C、
C、Waterintheaircoolershouldbedrainedregularly.;
D、
D、Waterintheaircoolershouldbekeptclean.
发布时间：2025-07-09 08:31:32
