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【单选题】
电梯按速度分类（）的电梯简称为低速电梯。
A.
0.63m/s
B.
1m/s以下
C.
2m/s以下
D.
3m/s以下
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相关题目：
【单选题】听力原文： Junk food, too little exercise and an increasingly sedentary life style, all well-known factors in the spiraling problem of childhood obesity in Britain. The causes are clear, but the government...
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