聚合反应是放热反应,裂解反应是吸热反应.
参考答案:对
— So, you didn't take his advice?
— No. _____ his advice, I _____ such a silly mistake. [ ]
A. Were I to take; shouldn't have made
B. If I had taken; would make
C. Had I taken; wouldn't have made
D. Have I taken; won't have made
离心风机所输送的气体温度比设计的工作状态降低,会引起风机全压升高,()增大。