漩涡流量计安装时,应保证流量计于管道同轴,连接法兰的对中误差应小于()D。
A. 0.01
B. 0.02
C. 0.1
D. 0.2
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尾煤跑粗的主要原因有()。
A. 给矿量大,浮选时间不足
B. 浮选入料中细粒含量多
C. 浮选入料浓度太大
D. 充气搅拌不足,煤粒浮不起
我国财务会计报告的责任主体是()。
A. 总会计师
B. 单位领导人
C. 单位负责人
D. 会计机构负责人
Which of the listed statements is correct concerning refrigeration systems?()
A. Dehydrators must be used continuously in a refrigeration system
B. A 25 ton refrigeration system has the same cooling effect as melting 25 tons of ice in 24 hours
C. A thermostatic expansion valve is used to control refrigerated space temperature
D. The liquid receiver functions to collect and remove non- condensable gase