[填空题] 鸭的孵化期是()天,鹅的孵化期()天。
[主观题]鸡的孵化期是21天,鸭的孵化期比鸡长。鸭的孵化期是多少天?
[单选题]鹅的孵化期为()天。A .21B .31C .28D .19
[填空题] 鸡的孵化期为()天。
[单选题]鸡蛋的孵化期通常为()天。A .18B .21C .28D .31
[单选题]鸡的孵化期是_______天。A.11B.20C.21D.30
[单选题]种蛋孵化期1—19天,所需温度为()℃。A .37B .37.8C .38D .37.2
[单选题]各种家禽的孵化期,鸡()天A .21B .25C .28D .31