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【单选题】
如图 1.2 所示三铰拱架中,若将作用于构件 AC 上的力偶 M 搬移到构件 BC 上,则 A 、 B 、 C 各处的约束力 。A.
都不变
B.
只有C处的不改变
C.
都改变
D.
只有C处的改变
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【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
【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
【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
【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
【单选题】All of the following are mentioned as similarities between Leif Erikson's voyage and Biarni's voyage EXCEPT ______.
A.
both visited Norway
B.
both returned to Greenland
C.
both visited Wineland
D.
both visited Helluland
【简答题】纵波也称为(),横波也称为()
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