质量鉴定时，隧道内悬挂的换算系数为（）。
A.0.13
B.0.40
C.1.00
D.1.30
参考答案：D
AIDS is said ______ the biggest health challenge to both men and women in that area over the past few years.
A．that it is
B．to be
C．that it has been
D．to have been
氧气瓶、乙炔瓶在使用过程中，瓶与瓶之间的距离应保持在5m以上，气瓶与明火的距离应保持在 ( )m以上，当不能满足安全距离要求时，应有隔离防护措施。
A．4B．6C．8D．10
