某鸡场7日龄仔鸡，出现单侧或双侧跗关节以下扭转，向外屈曲，多关节肿大，变形，长骨和胯骨短粗，腓肠肌腱脱出，可能的疾病是()
A. 锰缺乏症
B. 锌缺乏症
C. 胆碱缺乏症
D. 盐酸缺乏症
E. 维生素D缺乏症
查看答案
______ means the level for which minimum appropriate protective security measures shall be
A. Security level 1
B. Security level 2
C. Security level 3
D. Lowest safety level
某施工升降机型号为SCD2001200，其中C表示其型代号为()式
A. 钢丝绳式
B. 齿轮齿条
C. 导轨架
D. 混合
When the opening pressure of a diesel fuel injector is greater than that specified by the
A. quantity of fuel injected is decreased
B. quantity of fuel injected will always be increased
C. start of injection is advanced
D. duration of injection will always be greater
影晌照片颗粒性的因素不包括
A. X线光子数量
B. 胶片结构
C. 增感屏性能
D. 胶片γ值
E. 定影条件
微信支付 
支付宝支付