【简答题】某批种蛋的孵化效果如下 : 上蛋数 无精蛋 中死蛋 毛 蛋 出雏数 一照 二照 一照 二照 强 雏 弱 雏 10752 450 50 150 290 512 9200 100 求:受精蛋数= 受精率= 受精蛋孵化率= 入孵蛋孵化率= 健雏率=
【单选题】The position of the piston parts in relation to each other is secured by means of _____ in the crown.
【单选题】Prisons in some countries are short of staff, ______ means each prison officer is overworked and underpaid.
【单选题】HTML文档的树状结构中,_标签为文档的根结点位于结构中的最顶层。
【单选题】环形钢筋混凝土电杆在立杆前应进行外观检查,要求杆身弯曲不应超过杆长的()。
【单选题】The position of the piston parts in relation to each other is secured by means of _____ and a dowel pin in the crown.
C.
machine-turned recesses
【单选题】HTML 文档的树状结构中,标签为文档的根节点,位于结构中的最顶层。( )