经鼻气管插管前鼻腔滴入3%麻黄碱之目的（）
A.局部麻醉
B.润滑鼻腔
C.收缩鼻粘膜血管
D.预防诱导时低血压
E.预防感染
参考答案：C
输送空气或烟气，温度高于70℃的风管，其法兰连接处的垫料应为（）。
A．橡胶板
B．石棉橡胶板
C．闭孔海绵橡胶板
D．金属垫片
______ the extreme levels of air pollution, city authorities have started to take measures to quickly reduce pollution levels and protect city dwellers.
A．In spite of
B．As well as
C．In response to
D．By means of
