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【单选题】
在三面投影体系中,垂直于 V 面的直线称为:A.
垂直线
B.
铅垂线
C.
侧垂线
D.
正垂线
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【单选题】There __________ a football match between Class 1 and Class 3. [ ]
A.
is
B.
are
C.
am
【单选题】听力原文： Between 1987 and 1991 ,three groups of American women, numbering 27 in all, between the ages of 35 and 65,were given month-long tests to determine how they would respond to conditions resembling...
A.
30
B.
27
C.
65
D.
35
【单选题】There is less cooperation between nations now because it is ____________.
A.
strained by quarrels between nations on currency values
B.
weakened by an uneven recovery from the crisis
C.
used as a weapon against rivals
D.
intensified by changing global currency values
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