企业应根椐重大危险源目标模拟事故状态，制订出各种事故状态的应急处置方案。
参考答案：对
—Where is Jack? I haven’t seen him for a long time.
—He ______ HK with his family. I think he is having a wonderful time there.
A．went to
B．was in
C．has gone to
D．has been to
气体带电分为高速冲击带电，（），高速喷出带电三种形式。
A、气体冲入液体带电
B、液体冲入气体带电
C、气体接触分离带电
D、液体含水带电
