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【单选题】
在设计楼梯时,一般踏步宽b和踏步高h的关系式为()。A.
2h+b=600~620mm
B.
2h+b=450 mm
C.
h+b=600~620 mm
D.
2h+b=500~600 mm
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举一反三
【单选题】The celebration of Thanksgiving Day has been observed to thank ______.
A.
God
B.
their ancestors
C.
their parents
D.
the Pilgrims
【简答题】What encouraging sign has been observed by experts about Venice?
【单选题】A Pike has, been observed to live, according to Gesner, as long as ______.
A.
any other fresh - water fish
B.
forty years
C.
it has the help of the sun's heat
D.
two centuries
【单选题】The celebration of Thanksgiving Day has been observed to thank ______.
A.
God
B.
their ancestors
C.
their parents
D.
the pilgrims
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