题目氢气的爆炸极限为A. 4.0%-75%B. 4.0%-75.6%C. 5.0%-75.6%D. 5.0%-75%氢气的爆炸极限为A. 4.0%-75%B. 4.0%-75.6%C. 5.0%-75.6%D. 5.0%-75%题目解答答案B. 4.0%-75.6%