A:刺激神经纤维中部,产生的兴奋沿神经纤维向两侧传导
B:兴奋在神经纤维上的传导方向是由兴奋部位至未兴奋部位
C:神经纤维的兴奋以局部电流的方式在神经元之间单向传递
D:在神经纤维膜外,局部电流的方向与兴奋传导的方向相反
某收割机厂2016年生产收割机的情况如下:第一季度生产1000台,第二季度生产1500台,第三季度生产2500台,第四季度生产4000台。
在赛场上,中国学生因为没有给外国小朋友准备礼物,尴尬之下只能以人民币回赠;在餐桌上,中国孩子热烈讨论,谈笑风生,外国孩子却在安静就餐……这是在英国坎特伯雷举行的世界奥林匹克数学竞赛中出现的真实场景。同学们对此场景有不同认识,你认为正确的是:( )①在公共场所大声喧哗是不文明、缺乏公德的表现②在国际交往场所,是否文明礼貌会反映个人修养③不同国家有不同的文化,要尊重差异、保持特色④在国际交往场所,是否文明礼貌会影响国家形象
根据短文理解,选择正确答案。
Brave
Type: 3D cartoon Comedy Running time: 95 minutes
Merida, a princess, refused to marry a person that she dislikes. This causes trouble for her family and the whole country. Merida turns to a witch(女巫) for help. In doing so, her family and the country are in danger. Merida must save her family and the country before it is too late. X K b1.Com
The Grey
Type: Action Running time: 117 minutes
The Grey is based on the short story “Ghost Walker” written by Ian Mackenzie Jeffers. It's about a number of oil men who are in trouble in Alaska after a plane crash(空难). They have to fight against grey wolves that threaten(威胁) their lives.
Mirror Mirror
Type: comedy Running time: 106 minutes
You must know the story of Snow White. Would you like to see this story again? Come to see Mirror Mirror. It's a comedy about Snow White. Lily Collins and Julia Roberts are the main actresses in this interesting movie.
Chimpanzee
Type: Documentary Running time: 78 minutes
This movie is directed by Alastair Fothergill and Mark Linfield. It's a 2012 nature documentary film about a young chimpanzee named Oscar. He is alone in the African forests until he is raised by another chimpanzee. The chimpanzee takes care of Oscar like his own child.
甲地(40°N,20°E)位于乙地(20°N,40°E)的方向( )