发热最常见的病因为
A．变态反应
B．内分泌代谢障碍
C．感染性疾病
D．无菌性坏死组织吸收
E．体温调节中枢功能失调
参考答案：C
Mr. Smith came to our school in 2003. He _____ here for 10 years.
A．works
B．worked
C．will work
D．has worked
闸板防喷器的正常关闭压力为（）PSI。
A.800
B.1500
C.2000
D.3000
