现场使用节流管汇承压能力必须与所用防喷器组承压能力相匹配。（）
参考答案：对
--Do you have a plan for May Day holiday?___
--I’m going to Thailand with my parents!
A．You don’t say!
B．You can say that again.
C．Good luck to you.
D．I dare say.
什么叫直流冷却水系统？简述优缺点？
