问题 问答题 简答题

磨煤机停止运行时,为什么必须抽净余粉?

答案

参考答案:

停止制粉系统时,当给煤机停止给煤会,要求磨煤、排粉机再运行一段时间方可相继停运,以便抽净磨煤机内余粉。这是因为磨煤机停止后,如果还残余有煤粉,就会慢慢氧化升温,最后会引起自燃爆炸。另外磨煤停止后还有煤粉存在,下次启动磨煤人,必须是带负荷启动,本来电动机启动电流就较大,这样会使启动电流更大,特别对于中速磨煤机会更明显些。

单项选择题 A1/A2型题
单项选择题

Randy Kraus was paralyzed. His left side was useless. But his right hand was (1) enough to lift a bucket to his forehead. Once, he’d been a police officer and owned a private-eye agency. Once, he’d been p and able. Now, he felt he was nothing.

His (2) started with Parkinson’s disease, but it didn’t (3) there. In July 2002, the 60 year old Kraus went into the hospital for an operation to control the shaking. (4) , during the operation, he had a stroke. He was paralyzed. The (5) man, who loved golf, could think, but couldn’t (6) . Kraus wanted the doctors to (7) it to him straight. "You may never walk again, " they told him. "Maybe you won’t (8) be able to talk. "

Once at home, he (9) he couldn’t lift a fork or take a drink by himself. Physical treatment was so painful and slow. What did he have to (10) for So now Kraus held the gun against his head. (11) the cold metal on his skin, he began to consider not his pain, but the pain he (12) cause his wife, daughters and grandchildren. He didn’t pull the trigger.

"You are where you are", his exercise physiologist, Andrew Garud told him. "The pace would be slow; the pain would be (13) . But as long as you are (14) , you have the ability to get better. " After three months of (15) with Garud, Kraus wanted to see if he could (16) . He could. Then he took three steps, sat down and cried like a baby. One step (17) to another. Next he managed a short walk. It was the hardest (18) of Kraus’s life.

Garud kept saying he could (19) more. Now, Kraus can brush his teeth, shave himself and get around the house with a walker. Little success only the paralyzed can (20) understand.

12().

A.should

B.must

C.would

D.need