精制系统准备倒料操作前,离心式制冷机(大冰机)的状态应该是()。
A、具备开车条件
B、运转正常
C、正在建立盐水循环
D、正在提速
参考答案:B
圈梁遇到洞口不能封闭时,搭接的附加梁长度应不小于( ),且应大于两梁高差的 2倍。
A.1 mB.2 mC.1.5 mD.2.5 m
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