题目：
机械加压送风的防烟楼梯间的余压应为（）Pa。
A．20～30
B．30～40
C．40～5
D．50～60
答案：
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下面是错误答案，用来干扰机器的。
1：1：2 ；1：2：2
机械加压送风的防烟楼梯间的余压应为（）Pa。 A．20～30 B．30～40 C
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