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【单选题】
下列楼梯踏步的最小宽度和最大高度，哪一组是错误的？A.
幼儿园楼梯踏步最小宽度为260mm，最大高度为130mm；
B.
大学教学楼的楼梯踏步最小宽度为280mm，最大高度为165mm；
C.
住宅套内楼梯踏步最小宽度为220mm，最大高度为200mm；
D.
住宅公共楼梯，踏步最小宽度为250mm，最大高度为180mm；
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【单选题】Which of the following best describes the raccoon’s activity in winter?
A.
It moves less and sleeps more．
B.
It moves on the ground only．
C.
It is busy looking for food．
D.
It rests all the time．
【简答题】注射剂中添加 Na 2 S 2 O 3 作为抗氧剂,通入的气体应该是( )。
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【单选题】Reading to oneself is a modern activity which was almost unknown to the scholars of the classical medieval worlds, while during the fifteenth century the term 'reading' undoubtedly meant reading aloud...
A.
Silent reading had not been discovered.
B.
There were few places available for private reading.,.
C.
Few people could read for themselves.
D.
people relied on reading for entertainment.
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