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问题 问答题 简答题

试述尿素装置停车过程中的操作要点？

答案

参考答案：

（1）先降负荷到70%；

（2）停解吸和水解系统，水解器保温保压；

（3）停蒸发和造粒，破真空降温后，予以置换；

（4）停氨五分钟后停CO2，甲铵泵打循环，系统封塔

（5）冲洗各物料管线，但不得冲洗高压洗涤器惰气排放阀前管线；

判断题

岸边集装箱装卸桥起重量是指额定起重量加集装箱吊具的自重。( )
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单项选择题

A Bluetooth device can be either a master or a slave and any of the devices within a ___30___can be the master. There is only one master and there can be up to ___31___ active slave devices at a time within a single network. In addition, a device may be a standby slave or a parked slave. There can be up to ___32___.parked slaves. If there are already maximum number of active slaves, then a parked slave must wait until one of the active slaves switches to ___33___ mode before it can become active. Within a network, all ___34___ communications are prohibited.

34（）

A. master-to-master

B. Master-to-slave

C. slave-to-slave

D. Slave-to-master
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