A variable star is one that（）.<br>A:exhibits a change in magnitude<br>B:has a changing declination<br>C:is increasing in SHA<br>D:is also known as a red giant

A variable star is one that（）.
A:exhibits a change in magnitude
B:has a changing declination
C:is increasing in SHA
D:is also known as a red giant

出自：海船船员证

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