题目2.有限空间氧含量合格范围为()VOL。A. 18.0%~22.5%B. 19.5%~23.5%C. 20.0%~24.0%D. 19.0%~24.5%2.有限空间氧含量合格范围为()VOL。A. 18.0%~22.5%B. 19.5%~23.5%C. 20.0%~24.0%D. 19.0%~24.5%题目解答答案B. 19.5%~23.5%