单选题When securing a flash-type evaporator for an extended period of time, you should （）.Afill the unit with saltwaterBfill the unit with de-scaling compoundCcompletely drain the unitDtightly seal the unit to exclude air
单选题
When securing a flash-type evaporator for an extended period of time, you should （）.
A
fill the unit with saltwater
B
fill the unit with de-scaling compound
C
completely drain the unit
D
tightly seal the unit to exclude air
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