如果温度降到零下，排空水系统。
A.When the temperature is below zero, depressurize the water system. B.If the temperature drops below zero, deflate the water system. C.If the temperature decreases to less than zero, drain the water system.正确答案C
如果温度降到零下，排空水系统。
A.When the temperature is below zero, depressurize the water system. B.If the temperature drops below zero, deflate the water system. C.If the temperature decreases to less than zero, drain the water system.正确答案C
