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问题 多项选择题

机械设备空负荷试运转结束后，应立即进行( )工作。

A．切断电源和其他动力来源

B．进行必要的放气(汽)、排水或排污及必要的防锈涂油

C．对蓄能器和设备内有余压的部分进行转压

D．按各类设备安装规范的规定，对设备几何精度进行必要的复查，各紧固部分进行复紧。

E．设备空负荷(或负荷)试运转后，应对润滑剂的清洁度进行检查，清洗过滤器，需要时可更换新油(剂)

答案

参考答案：A,B,D,E

单项选择题

A little boy invited his mother to attend his school’s first teacher-parent meeting. To the little boy’s (1) , she said she would go. This (2) be the first time that his classmates and teacher (3) his mother and he felt (4) of her appearance. Although she was a beautiful woman, there was a severe sear (疤痕) that (5) nearly the entire right side of her face. The boy never wanted to (6) why or how she got the sear.At the meeting, the people were (7) by the kindness and natural beauty of his mother (8) the sear, but the little boy was still embarrassed (尴尬) and (9) himself from everyone. He did, however, get within (10) of a conversation between his mother and his teacher.The teacher asked (11) ," How did you get the scar on your face"The mother replied, " (12) my son was a baby, he was in a room that caught fire. Everyone was (13) afraid to go in because the fire was (14) , so I went in. As I was running toward his bed, I saw a long piece of wood coming down and I placed myself over him trying to protect him. I was knocked (15) but fortunately, a fireman came in and saved both of us. " She (16) the burned side of her face. "This scar will be (17) , but to this day, I have never (18) what I did. "At this moment, the little boy came out running toward his mother with tears in his eyes. He held her in his arms and felt a great (19) of the sacrifice (牺牲) that his mother had made for him. He held her hand (20) for the rest of the day.

第（2）空应选择（）

A．would       

B．could     

C．should     

D．must
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单项选择题

当空气中的CH4含量在（）范围内时，遇明火或700℃以上的热源即发生爆炸

A、30%-40%。

B、5%-15%。

C、40%-50%。

D、55%-65%。
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