（）不是电控发动机的主要控制功能。
A.燃油喷射控制
B.点火控制
C.排气温度控制
D.进气控制
参考答案：C
— Thanks a lot, Mr. Wang. I don't know how to ________ the help you gave me during my stay here.
— It's my pleasure. Welcome to China again when you have time. [ ]
A. pay off
B. pay back
C. pay for
D. pay to
患者扁桃体剥离术后2d，突感咽痛加剧，体温39℃，检查见扁桃体窝白膜污秽，腭弓肿胀，应首先考虑（）
A.正常术后反应
B.创面感染
C.出血前兆
D.咽旁脓肿
E.以上均不是
