【判断题】相互易位杂合体会产生败育的花粉,其原因是在性母细胞减数分裂的后期 I 的相邻式分离,会形成和倒位杂合体相同的重复 - 缺失染色体。A. 错 B. 对
【单选题】— It is unwise for some people to drive and talk on a cell phone. —_______. It’s very dangerous.
【判断题】轻钢龙骨隔墙安装中,竖向龙骨间距一般不大于800mm。
【简答题】Man has a blood tie with nature and nobody can live outside nature. Nature provides us with everything we need: the air we breathe, the water we drink, and the food we eat. For quite a long time after...
【单选题】男性,30岁。于8月2日突发寒战,高热,体温39~40℃,剧烈胸痛,呼吸急促,咳嗽,血性泡沫痰。查体:两肺可闻及散布湿性啰音,胸片呈支气管肺炎改变。病人于发病前1周曾到过云南西部狩猎。本病的传染源包括()
【简答题】阅读理解。 Mr Knott was a teacher. He taught in a big school in London. He lived a long way from the school, so he was usually quite tired when he got home. At nine o'clock one evening when he was in bed, ...
【简答题】阅读理解。 Mr.Knott[not] was a teacher. He taught in a big school in London. He lived a long way from the school, so he was usually quite tired when he got home. At nine o'clock one evening when he was in ...
【简答题】Man has a blood tie with nature and nobody can live outside nature. Nature provides us with everything we need: the air we breathe, the water we drink, and the food we eat. For quite a long time after...