题目氢气爆炸极限体积比约为( )A. 1%~5%B. 4%~75.6%C. 10%~80%D. 50%~90%氢气爆炸极限体积比约为( )A. 1%~5%B. 4%~75.6%C. 10%~80%D. 50%~90%题目解答答案B. 4%~75.6%