论述生产∮16螺纹钢时,轧钢作业区的切分轧制与普通单根轧制相比,有什么优点?
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ISDN用户—网络接口(UNI)定义了基本速率接口(2B+D)和()接口两种类型的接口。
()于17世纪实际编制了第一个国家预算,其他资本主义国家也陆续接受这种做法。
A. 英国
B. 法国
C. 德国
D. 美国
In which of the listed refrigeration system components does superheating of the refrigerant take place?()
A. Expansion valve
B. Evaporator
C. Drier
D. Receiver
When lighting off an auxiliary boiler, which of the problems listed could cause the burners to sputter?()
A. cold fuel oil
B. low fuel oil pressure
C. low atomizing steam pressure
D. water in the fuel oil