承重支架每级加载预压均应对支架进行沉降监测,当最后两次支架沉落量观测平均值之差不大于()时,可以终止荷载预压。
A. 2mm
B. 5mm
C. 10mm
D. 20mm
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Your network uses the172.12.0.0 class B address. You need to support 459 hosts per subnet, while accommodating the maximum number of subnets. Which mask wouldyou use?()
A. 255.255.0.0.
B. 255.255.128.0.
C. 255.255.224.0.
D. 255.255.254.0.
一段磨矿有利于处理()嵌布的铁矿石。
A. 细粒
B. 粗粒
C. 浸浆状
D. 浸染状