二项分布接近泊松分布的条件是() ["μ=nπ","μ≥20","μ=0.5","n很大且π接近0","n很大且π接近0.5"]
放射性131I治疗甲亢,症状明显缓解或治愈在治疗的()。 ["6个月","3~4个月后","4~6个月","2~3个月内","7~10天"]
头部遭棍击,右耳流血性脑脊液。3天后主诉头痛加重伴呕吐,平卧后头痛可减轻。诊断首先考虑()。 ["小脑幕切迹疝","小脑扁桃体疝","视神经损伤","颅内低压","原发性脑干损伤"]
图示结构各杆线刚度i相同,用力矩分配法计算时,力矩分配系数μBA应为() ["1/2","4/7","4/5","1"]
排烟管道采用不燃材料制作,常用的排烟管道釆用镀锌钢板加工制作,厚度按高压系统要求,并应采取隔热防火措施或与可燃物保持不小于()的距离。 ["100mm","150mm","500mm","600mm"]
通常鉴别储粮发热有哪几种方法?