我国现阶段实行的安全生产管理体系和以往的区别是：突出"企业负责"。
参考答案：对
Look, Danny! Here's a letter __________ Li Ming.[ ]
A. form
B. from
C. at
Nothing_______ after the terrible fire which had been caused by someone smoking in bed.
A．left
B．was remained
C．remained
D．continued
