天然气按气相态划分为（）。
A、腐殖气、腐泥气和腐殖腐泥气
B、游离气、溶解气、吸附气和固体气
C、干气、湿气
D、生物气、热解气
参考答案：B
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
点击窗口内的按钮时，产生的事件是( )。
A．MouseEvent B．WindowEventC．ActionEvent D．KeyEvent
