若出现(),原料预热炉必须紧急熄火。
A.炉膛超温时
B.火焰扑炉管时
C.进料中断时
D.炉管烧穿时
参考答案:D
(2013·兰州一中考前冲刺)It is the third time so far that such a festival________in my hometown.
A.is held
B.has been held
C.will be held
D.had been held
该患者既往有前列腺增生病史,适宜选用α受体阻滞剂()
A.美托洛尔
B.多沙唑嗪
C.贝那普利
D.硝普钠
E.肼屈嗪