鸟类的身体呈流线形,这种结构特点的意义是( ) A.有利于减轻体重 B.能增加排 发布时间:2017-04-17 19:02 │ 来源:www.tikuol.com 题型:选择题 问题: 鸟类的身体呈流线形,这种结构特点的意义是( )A.有利于减轻体重B.能增加排便的坚固性C.飞行中可减轻空气的阻力D.能快速扇动两翼
题型:选择题 根据句意和首字母填写单词。1. Hemingway is her favorite a_____.2. He was the only little kid at the p_____. 3. She always listens to c_____ music. 4. I'm really a_____ because I can't find my backpack. 5. I always go to c_____ because I love music. 6. It's c_____ because it makes up 50% of the final exam. 查看答案
题型:选择题 用单相位鉴别器来检测待并发电机与电网频差方向所包括的部件有()。A.电压比较器,滤波器B.电压比较器,微分电路C.RS触发器,滤波器及微分电路D.RS触发器,电压比较器及微分电路 查看答案