皮皮学，免费搜题
登录
搜题
【判断题】
“在100多亿年前，有一个很大的星系际云，在自引力作用下收缩，在收缩中分成几个云，其中一个大云形成银河系；三个分别形成大、小麦哲和比邻星系。大云收缩中成为球状，开始时内部密度比较均匀。由于湍流和其它原因，逐渐出现了一些密度较高的区域，这些区域就形成球状星团。收缩中，云的中心密度增加最快，逐渐形成一个中心密集区，受到这中心密集区的吸引，球状星团向它降落，围绕着中心密集部分，也就是围绕着，在偏心率很大而且对面倾角也很大的椭圆轨道上转动起来。随着大云的收缩，内部运动渐趋一致，有一个转动方向占了上风，而且由于角动量守恒，转动加快，尚未形成恒星的互相碰撞，损失能量，扁化为，逐渐形成了大量的恒星，它们都在大致圆形的轨道上绕着转动。……”这是源自弥漫说A.
正确
B.
错误
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】Research into new technologies provides a
A.
negative externality, and too few resources are devoted to research as a result.
B.
negative externality, and too many resources are devoted to research as a result.
C.
positive externality, and too few resources are devoted to research as a result.
D.
positive externality, and too many resources are devoted to research as a result.
【简答题】The new trend in artificial intelce research stems from
【单选题】The major contribution of this study is to ______.
A.
develop a new research technique easily transferred from one area to another
B.
make a comprehensive analysis of juvenile delinquency
C.
demonstrate the successful application of new research techniques in a new area
D.
modify creatively the previous research finding of juvenile delinquency
【简答题】The new economic research will not put an end to that dispute.
相关题目：