常用的防松措施有：①摩擦力防松；②（）防松。
A、机械防松
B、机动防松
C、摩擦防松
D、电动防松
参考答案：A
风险定量分析工具和技术不包括( )。
A．访谈
B．计划会议
C．敏感性分析
D．决策树分析
Although they lost their jobs, saving and unemployment benefits allow the couple to _______ their
comfortable home. [ ]
A. come up with
B. catch up with
C. hold on to
D. look forward to
employment benefits allow the couple to _______ their