题型:选择题 She doesn't know at the meeting. [ ]A. what can she say B. what she can speak C. what to say D. how to say 查看答案
题型:单项选择题 A1型题 对虾荧光病的流行特点描述错误的是()A.发病急,传播快,死亡率高 B.所有虾类均可感染该病原,从潘状幼体到幼虾均可患病 C.体长8cm以上的虾不感染该病原 D.幼体发病多在5~7月,尤其5~6月雨季为发病高峰期 查看答案