Of the following statements about the fusible plug,which one is true?_____.
A.
This fusible plug is not necessary for the safety of the machine.
B.
This fusible plug only contributes to the safety of the system after the machine's outlet.
C.
Most marine compressors usually have a fusible plug fitted immediately on the outlet of the after cooler.
D.
The installation of the fusible plug is to meet the national regulation.