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【多选题】
关于Poisson分布，正确的是（）。A.
总体均数与总体标准差相等
B.
其概率函数图不可能出现负偏峰的图形
C.
假定每10分钟内记录到的放射性脉冲数服从Poisson分布，若在某10分钟内记录值为X，则2X可看20分钟内记录到的放射性脉冲数，根据Poisson分布的可加性，它也服从Poisson分布
D.
若变量X服从Poisson分布，则它不可能取0值
E.
Poisson分布是离散型随机变量的概率分布
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皮皮学刷刷变学霸
举一反三
【单选题】avid Anderson says______.
A.
he encountered some discrimination and ridicule when he was working as a secretary
B.
he received encouragement and acceptance from the women secretaries
C.
men make better secretaries than women do
D.
men can do well in a female-dominated field
【单选题】男性，34岁，右第4～7肋骨折，呼吸极度困难，发绀，出冷汗。检查：BP65/40mmHg, 右胸饱满，气管向左侧移位，叩诊鼓音，颈、胸部有广泛皮下气肿，首要的处理方法是
A.
立即开胸探查
B.
胸腔穿刺排气减压
C.
输血、补液
D.
气管插管辅助呼吸
E.
吸氧
【简答题】This can be fixed to your office furniture or to the walls.
【单选题】The silver heart left the office, swinging and banging itself independently against the office furniture as it indignantly departed .
A.
walking quickly and bumping into every piece of office furniture when Maxwell left angrily
B.
walking unsteadily and banging into furniture because it was very annoyed
C.
throwing up its arms and banging on office furniture when it left elegantly
D.
throwing up his arms and banging on office furniture angrily when he left
【单选题】男性，34岁，右第4～7肋骨骨折，呼吸极度困难，紫绀，出冷汗。检查：BP65/40mmHg，右胸饱满，气管向左侧移位，叩诊鼓音，颈、胸部有广泛皮下气肿，首要的处理方法是
A.
胸腔穿刺排气减压
B.
气管插管辅助呼吸
C.
立即开胸探查
D.
输血、补液
E.
吸氧
【单选题】男性，34岁，右第4～7肋骨折，呼吸极度困难，紫绀，出冷汗。检查：BP65/40mmHg，右胸饱满，气管向左侧移位，叩诊鼓音，颈、胸部有广泛皮下气肿，首要的处理方法是
A.
气管插管辅助呼吸
B.
胸腔穿刺排气减压
C.
立即吸氧
D.
输血、补液
E.
开胸探查
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