在PLN电报中,日期用()表示。 ["四位数字,前两位为日,后两位为月","四位数字,前两位为月,后两位为日","六位数字,前两位为年,中间两位为月,后两位为日","四位数字,前两位为日,后两位为时"]
电流对人体的伤害作用中,()电流危险性最大。 ["高频","直流","工频","交流"]
以下哪种药材含针晶和菊糖() ["A、白术","B、党参","C、麦冬","D、天麻","E、木香"]
以下药材中含有乳汁管的是() ["A、党参","B、龙胆","C、地黄","D、木香","E、白术"]
锥形轴颈在轴承中受油膜压力的()作用,在转子产生径向振动时,轴向振动也要增大。 ["轴向分力","径向分力","圆周分力"]
奇邪