腹腔镜检查手术成功的关键是
A．良好的人工气腹
B．术前健康教育
C．手术操作技巧
D．严格掌握适应证及禁忌证
E．医护密切配合
参考答案：A
Which of the following statements regarding the option adjusted spread (OAS) is least accurate The option adjusted spread:（）
A. is used to adjust for the cost of the embedded option.
B. is the spread that accounts for non-option characteristics like credit risk, liquidity risk, and interest rate risk.
C. for a putable bond is the Z-spread minus the cost of the option.
常用的卫生人力和病床的测量指标有哪些？
