单选题If a fixed foam firefighting system on a ship is not of the premix type，a sample of the foam liquid must be tested by（）.Aa Coast Guard inspection officerBthe safety man aboard the unitCthe designated person in charge of the unitDthe manufacturer or his authorized representative
单选题
If a fixed foam firefighting system on a ship is not of the premix type，a sample of the foam liquid must be tested by（）.
A
a Coast Guard inspection officer
B
the safety man aboard the unit
C
the designated person in charge of the unit
D
the manufacturer or his authorized representative
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