矿石中的哪种有害杂质,能使钢产生“热脆”性?

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问题:

矿石中的哪种有害杂质,能使钢产生“热脆”性?

考点:高炉原料工高炉原料工题库
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It was Christmas, and there was a big party in the house. Guests came and went, but the party went on. Then the bell rang. Several people shouted, "Come in!"and a small man opened the front door and came in. Nobody knew him. But the host went to meet him, and took him to the bar for a drink. The man sat there happily for an hour and a half and drank.Then suddenly he stopped and looked at the host. "Do you know," he said, "nobody invited me to this party. I don't know you, 'I don't know your wife, and I don't know any of your guests. My wife and I wanted to go out in our car, but one of your guests' cars was in front of our gate, so I came here to find him and my wife is waiting in our car for me to come back.

小题1:What’s the date that day ?

A. Monday . .B It’s December 25th .

C. It’s Novermber 25th   D. It’s January 1st

小题2:Which sentence is Not true about the party ?

A.All the guests stayed there until the party was over .

B.There were lots of people at the party .

C.There were some drinks at the party .

D.Not all the guests knew each other小题3:How long did the small man stay at the party ?

A. For an hour .

B.For half an hour .

C.For 90 minutes .

D.For a while小题4:Why did the small man stay at the party ?

A.He was the host’s neighbor .

B.He was a friend of the host’s .

C.He wanted to say “Have fun ” to the people at the party

D.He wanted to look for the person whose car was in front of his gate .小题5:The best title is ___.

A. A small Man

B.A Strange Guest

C.A Friendly Host

D.A funny Man

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孕妇妊娠41周,羊水胎粪污染,胎儿宫内窘迫,急诊剖宫产一男婴。出生时全身苍白,无自主呼吸,HR60次/min,四肢松弛,刺激四肢有轻微收缩。

关于肾上腺素的应用,叙述正确的有(提示经正压通气及胸外心脏按压30s后,患儿仍然没有自主呼吸,心率50次/min左右。考虑用肾上腺素) ()

A.心脏停搏或在30s正压人工呼吸和胸外心脏按压后,心率持续小于60次/min为指征

B.可以静脉或气管内用药

C.静脉用药每次用量为1∶10000溶液0.1~0.3ml/kg

D.气管内用药剂量宜减少

E.如需重复用药,剂量加大到每次1mg

F.用药后继续通气及胸外心脏按压

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如图往保温瓶中装入大半瓶刚烧开的水,盖上软木塞后,观察到木塞很容易跳起,探究其原因,一是瓶内温度高的水________成水蒸气,二是瓶内气体受热膨胀,使瓶内气体压强__________(填“大于”、“小于”或“等于”)外界大气压。但第二天又会出现较难拔出木塞的现象,这是因为瓶内温度降低,水蒸气液化成水,瓶内气体压强________外界大气压(填“大于”、“小于”或“等于”)

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用病例对照研究方法探讨口服避孕药引起心肌梗塞的危险时,以下哪种情况可选作对照()。

A.高血压患者

B.乳腺增生病人

C.脑血管意外病人

D.腹泻患者

E.子宫肌瘤患者

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在期末对账时,应将会计部门财产物资明细分类账余额与财产物资保管和使用部门相关财产物资明细分类账核对。

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