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【单选题】
夜间观测若无法辨明云状时（）
A.
则估计天空被遮蔽看不到星光的部分为总云量
B.
低云量栏记–
C.
云状栏记–
D.
A.B.C都对
参考答案：
参考解析：
刷刷题刷刷变学霸
举一反三
【多选题】暗物质存在的观测证据有()
A.
引力质量超过光度质量
B.
星系团成员的运动能量超过亮物质的引力能量
C.
星系之中的恒星绕中心的旋转速度不随距离而减小
D.
宇宙的膨胀速度在增大
【单选题】Compared with their cosmologist(宇宙学家) colleagues, cosmogonists(星源学家) can sound a little old-fashioned. Edgar Allen Poe turned to the mysteries of cosmogony in an 1848 public lecture, just reprinted by...
A.
cosmogonists have more disagreements about the distant outer space
B.
astronomers have already obtained full knowledge about Uranus and Neptune
C.
there exist a lot of mysteries for cosmogonists in inner space
D.
cosmogonists are often reluctant to go home for the existence of deeper family mysteries