Which of the following is true about a "dry pipe" sprinkler system?下列哪一项关于干式喷水灭火系统的描述是正确的？（）

• A、A .It reduces the likelihood of the sprinkler system pipes freezing.减少了喷水灭火系统的管被冻住的可能性
• B、B .It is a substitute for carbon dioxide systems.二氧化碳灭火系统的替代品
• C、C. It uses less water than "wet pipe" systems.比湿式灭火系统更节水
• D、D .It maximizes chances of accidental discharge of water.增大的意外排水的可能性