A double star is a star that().
- Ahas a declination equal to twice that of the Sun
- Bcomprises two stars that appear close together
- Cis twice as bright as a single star
- Dsuddenly becomes much brighter and then fade
A double star is a star that().
A.星型(star)A星型(star)B环型(ring)C树型(tree)D总线型(bus)
2、A double male coupling is one that().
A double male coupling is one that().Ahas left hand twistBhas inside threads on both endsChas outside threads on both endsDtakes two men to operate
3、A large group of stars revolving aroun
A large group of stars revolving around a center is known as a().AclusterBshowerCconstellationDgalaxy
4、The girl is()of a film star.
The girl is()of a film star.AsomebodyBsomethingCanybodyDanything
5、The girl is()of a film star.
The girl is()of a film star.AsomebodyBsomethingCanybodyDanyone
6、A star is observed at lower transit. T
A star is observed at lower transit. The line of position derived from this sight is().Aon the prime verticalBa latitude lineCa longitude lineDof no special significance