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[名词解释] 类星体

题目标签:类星体
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参考解析:
.
刷刷题刷刷变学霸
举一反三

【多选题】类星体的主要物理特征是

A.
离地球非常遥远
B.
体积小而辐射能量极大
C.
具有特大的光谱红移
D.
发出周期性的脉冲信号

【单选题】Passage One Gravity is a slippery beast. We don’t know how strong it is, how it works or how fast its effects move. But this year we made progress. October saw the most accurate measurem...

A.
Because it gives people so much trouble.
B.
Because it is much stronger than expected.
C.
Because no progress has been made about it.
D.
Because it remains largely unknown to people.

【单选题】Passage One Gravity is a slippery beast. We don’t know how strong it is, how it works or how fast its effects move. But this year we made progress. October saw the most accurate measurem...

A.
Newton and Einstein had similar opinions on the speed of gravity
B.
the author of the passage is in favor of Einstein’s thought about the speed of gravity
C.
astronomers think that both Newton and Einstein were wrong on the speed of gravity
D.
Newton’s thought about the gravitational effect is out of date

【单选题】Gravity is a slippery beast. We don’t know how strong it is, how it works or how fast its effects move. But this year we made progress. October saw the most accurate measurement yet of Newton’s gravit...

A.
two things far apart might vibrate in unison
B.
the ripples in space-time are only imagined
C.
there exist gravitational waves
D.
abrupt, violent cosmic events lead to gravitational waves