突出矿井的防突工作必须坚持区域综合防突措施先行、局部综合防突措施补充的原则。
参考答案：对
刺激多种造血细胞分化成熟的细胞因子是（）
A.TNF
B.SCF
C.IL－2
D.TGF
E.IFN
— What do you do?
— I'm an engineer. I _____ in a company in Wuhan. I like my job very much. [ ]
A. work
B. had worked
C. will work
D. worked
