汉武帝时期之所以能对匈奴实行大规模的反击，主要因为[ ]
A．在强大的骑兵部队
B．有非常能干的文官武将
C．经济繁荣，国力强盛
D．匈奴已开始衰落
答案：C
The tools and techniques of quantitative risk analysis are （）.
A．contracting，contingency planning，alternative strategies，and insurance
B．interviewing，historical results，workarounds，and additional response development
C．checklists，damage control reports，standard allowances, and inspection
D．data gathering and representation techniques，and quantitative risk analysis and modeling techniques
在皮带安装时，施工人员应做好哪些方面的安全工作？
