单选题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（）.A15 minutes without rechargingB20 minutes without rechargingC25 minutes without rechargingD30 minutes without recharging
单选题
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
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