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【单选题】
地球上两点之间的航线建立最短的是指( )。A.
两点之间的直线长度
B.
两点之间的等角线长度
C.
两点之间大圆的弧长
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举一反三
【单选题】In the summer of 999, Leif Erikson voyaged to Norway and spent the following winter with King Olaf Tryggvason. Substantially the same account is given by both the Saga of Eric the Red and the Flat Isl...
A.
Leif Erikson did not visit America
B.
Biarni might have visited America before Leif Erikson
C.
Biarni did not visit Wineland
D.
Leif Erikson visited Wineland first
【简答题】海藻酸钠在分散染料轧染工艺中起什么作用?
【单选题】All of the following are mentioned as similarities between Leif Erikson’s voyage and Biarni's voyage EXCEPT that ______.
A.
they both visited Norway
B.
on the return voyage, both visited three different lands
C.
both returned to Greenland
D.
both visited Wineland
【简答题】纵波也称为(),横波也称为()
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