由于球瓣展开应用了球心角弧长计算法，所以球瓣下料可用（）下料样板法
A.一次
B.二次
C.三次
D.四次
参考答案：A
I didn't see your sister at the meeting. If she ______, she would have met my father. [ ]
A. has come
B. did come
C. come
D. had come
财务型保险转移风险是指单位或个人通过______，将面临的财产风险、人身风险和责任风险等转嫁给保险人的一种风险管理技术。
A．订立保险合同 B．预防风险C．转移风险 D．控制风险
