热介质系统是如何起动的？
参考答案：
热介质系统的起动：给现场控制盘通电；启动热介质循环泵，建立循环；打开燃料的供给阀门；检查控制盘上的各种信号灯显示是否正常；确定热介质炉的流量、压力、压差等参数是否满足点火；所有的参数都满足点火时，在控制盘上把选择开关"Controlswitch"打到"Pumpandburner"的位，这时，指示灯亮起来，燃烧头自动进入点火程序；在控制盘检查吹扫和点火程序是否正常，如果点火失败，按下燃烧器复位，重新点火，如果再次点火失败，应在故障显示栏上查明故障并排除，然后再点火。
Passage Four
| It’s so difficult to follow the ups and downs of a 2-year-old．One moment he’s beaming and friendly; the next he’s sullen (愠怒的) and weepy, often for no apparent reason. These mood swings, however, are just part of growing up. They are signs of the emotional changes taking place as your child struggles to take control of actions, impulses, feelings and his body. At this age, your child wants to explore the world and seek adventure. As a result, he’ll spend most of his time testing limits, his own, yours and his environment’s. Unfortunately, he still lacks many of the skills required for the safe accomplishment of everything he needs to do, and he often will need you to protect him. When he oversteps a limit and is pulled back, he often reacts with anger and frustration, possibly with a temper tantrum (发脾气) or sullen rage. He may even strike back by hitting, biting or kicking. At this age, he doesn’t have much control over his emotional impulses, so his anger and frustration tend to erupt suddenly in the form of crying, hitting or screaming. It’s his only way of dealing with the difficult realities of life. He may even act out in ways that unintentionally harm himself or others. It’s all part of being 2. It’s not uncommon for toddlers to be angels when you’re not around, because they don’t trust other people enough to test their limits. But with you, your toddler will be willing to try things that may be dangerous or difficult, because he knows you’ll rescue him if he gets into trouble. Whatever protest pattern he has developed around the end of his first year will probably persist for some time. For instance, when you’re about to leave him with a sitter, he may become angry and throw a tantrum in anticipation of the separation. Or he may whimper, or whine and cling to you. or he could simply become subdued and silent. Whatever his behavior, try not to overreact by scolding or punishing him. The best tactic is to reassure him before you leave that you will be back and, when you return, to praise him for being so patient while you were gone. Take solace in the fact that separations should be much easier by the time he’s 3 years old. |
The "ups and downs" (Para.1) of a 2 year-old refers to______.
A．his falling down and standing up
B．his successes and failures in doing things
C．his good and bad traits
D．his mood swings