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（）.<br>A:a Coast Guard inspection officer<br>B:the safety man aboard the unit<br>C:the designated person in charge of the unit<br>D:the manufacturer or his authorized representative

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

出自：海船船员证

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