眼球穿通伤按伤口的部位可分为哪三类?各类的临床特点及治疗方法?
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对服从正态分布的偶然误差，误差在[-δ，+δ]之外在10000次中有（）.
A. 6287次
B. 9594次
C. 9973次
D. 3173次
You are working on the cost budget for one project. Which of the following is true（）
A. This process assigns cost estimates to project activities including risks and contingency plans.
B. The cost baseline will be used to measure variances and future project performance.
C. This process assigns cost estimates for expected future period operating costs.
D. The cost baseline is the expected cost for the project.
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