Highest temperature encountered in refrigeration cycle should be________________?

A. constant pressure lines
B. constant temperature lines
C. constant total heat lines
D. constant entropy lines
E. constant volume lines

A. non-toxic
B. non-inflammable
C. toxic and non-inflammable
D. highly toxic and inflammable
E. none of the above

A. centrifugal
B. axial
C. miniature sealed unit
D. piston type reciprocating
E. none of the above

A. ineffective refrigeration
B. high power consumption
C. freezing automatic regulating valve
D. corrosion of whole system
E. breakdown of refrigerant