磁罗盘信号容易被干扰的原因是()。 A.地球磁场信号太弱 B.太阳光容易对地磁信号进 发布时间:2018-09-30 19:22 │ 来源:www.tikuol.com 题型:单项选择题 问题: 磁罗盘信号容易被干扰的原因是()。A.地球磁场信号太弱B.太阳光容易对地磁信号进行干扰C.地球磁场信号不稳定D.飞行器处在南北极
题型:单项选择题 It was unbelievable that the fans waited outside the gym for three hours just ______ a look at the sports stars. [ ]A. had B. having C. to have D. have 查看答案
题型:单项选择题 某猪场3日龄仔猪发病,主要表现精神沉郁,食欲废绝,排黄色水样稀粪,内含凝乳块,随后仔猪脱水昏迷死亡。剖检可见小肠黏膜充血,出血,胃内有凝乳块,肠系膜淋巴结充血水肿。细菌分离首选的培养基是()A.营养肉汤B.营养琼脂培养基C.血清琼脂培养基D.血液琼脂培养基 查看答案