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【单选题】
螺旋桨的“沉深”是指()。A.
螺旋桨上桨叶距水面的距离
B.
螺旋桨左右桨叶距水面的距离
C.
螺旋桨中轴距水面的距离
D.
螺旋桨上下桨叶距水面的距离
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反馈参考答案：
举一反三
【单选题】A first magnitude star is（）.
A.
2.5 times as bright as a second magnitude star
B.
3 times as bright as a second magnitude star
C.
5 times as bright as a second magnitude star
D.
10 times as bright as a second magnitude star
【单选题】A double star is a star that（）.
A.
has a declination equal to twice that of the Sun
B.
comprises two stars that appear close together
C.
is twice as bright as a single star
D.
suddenly becomes much brighter and then fades
【单选题】If a star seems to be moving in a wavy line, we ______ it of being a double star.
A.
doubt
B.
believe
C.
guess
D.
suspect
【简答题】在数据状态下报表模块中有哪些主要功能?
【单选题】Many people think that English soccer star David Beckham is( )a pop star( )a player.
A.
mainly than
B.
either or
C.
very much not
D.
more of than
【单选题】Muller believed that ______.
A.
the star orbits around the sun
B.
the star is disturbed by the Oort Cloud
C.
the star is throwing comets into the Oort Cloud
D.
the star is responsible for extinction of life on the Earth
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