细菌性 * * * * pH值为（）
A.3.8～4.4
B.5.0～6.5
C.4.0～4.7
D.5.0～5.5
E.6.5～7.0
参考答案：D
新建或大修高炉开炉前安装铁口煤气导出管的主要作用是加热铁口孔道。
Which of the following statements is the most appropriate title for the passage
Which of the following statements is the most appropriate title for the passage A．The Origins of GPSB．The Advantages of GPSC．The Future of GPSD．The Increasing Uses of GPS: Military and Civilian
A．The Origins of GPS
B．The Advantages of GPS
C．The Future of GPS
D．The Increasing Uses of GPS: Military and Civilian
