题目内容

据统计,无人机系统事故以上发生在()

A. 起降阶段
B. 巡航阶段
C. 滑跑阶段

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CPD-A(枸橼酸钠、磷酸盐、葡萄糖一腺嘌呤)全血保存有效期为()

A. 10天
B. 21天
C. 28天
D. 30天
E. 35天

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