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单选题
44.Entrance Stairs or step operate in conjunction with but are not
44.Entrance Stairs or step operate in conjunction with but are not
integral part of entrance doors.
A
Entrance Stairs or step are connected with entrance doors and moveaccordingly.
B
Entrance Stairs or step are integrated with entrance doors and operatetogether.
C
Although entrance Stairs or step operate together with entrance doors,they are not integrated.
答案解析
正确答案：C
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