Deck foam systems，designed to protect cargo areas on tankers built after January 1，1975，must have a supply of foam-producing material to operate the system at its designed rate of foam production for（）.<br>A:15 minutes without recharging<br>B:20 minutes without recharging<br>C:25 minutes without recharging<br>D:30 minutes without recharging

Deck foam systems，designed to protect cargo areas on tankers built after January 1，1975，must have a supply of foam-producing material to operate the system at its designed rate of foam production for（）.
A:15 minutes without recharging
B:20 minutes without recharging
C:25 minutes without recharging
D:30 minutes without recharging

出自：海船船员证

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