煤在什么情况下能自燃?

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问题:

煤在什么情况下能自燃?

考点:中控操作员考试新型干法水泥中控操作员新型干法水泥中控操作员题库
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过去耕地主要依靠牛拉犁,现在已经实现了机械化种植.若一头牛的功率为500W,一台拖拉机的功率为25kW,则拖拉机工作4h所做的功由这头牛来完成需要工作______h.

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I was a single parent of four small children, working at a low paid job. Money was always tight, but we had a (1) over our heads, food on the table, clothes on our backs, and if not a lot, always (2) . Not knowing we were poor, my kids just thought I was (3) . I’ve always been glad about that.

It was Christmas time, and although there wasn’t (4) for a lot of gifts, we planned to celebrate with a family party. But the big (5) for the kids was the fun of Christmas (6) .

They planned weeks ahead of time, asking (7) what they wanted for Christmas. Fortunately, I had saved MYM120 for (8) to share by all five of us.

The big (9) arrived. I gave each kid a twenty-dollar bill and (10) them to look for gifts of about four dollars each. Then everyone scattered. We had two hours to shop; then we would (11) back at the "Santa’s Workshop"

Driving home, everyone was in high Christmas spirits, (12) my younger daughter, Ginger, who was unusually (13) She had only one small, flat bag with a few candies—fiftycent candies I was so angry, but I didn’t say anything (14) we got home. I called her into my bedroom and closed the door, (15) to be angry again. This is what she told me.

"I was looking (16) thinking of what to buy, and I (17) to read the little cards on the ’Giving Trees’. One was for a little girl, four years old, and all she (18) for Christmas was a doll. So I took the card off the tree and (19) the doll for her. We have so much and she doesn’t have anything. "

I never felt so (20) as I did that day.

17()。

A.quiet 

B.excited 

C.happy 

D.ashamed

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Access数据库包括表、查询、窗体、报表、 【8】 、宏和模块等基本对象。

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简述“六对”的内容。

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作为种子标签的印刷品上使用的汉字、数字和字母的字体高度不应小于()

A.1.2㎜

B.1.5㎜

C.1.8㎜

D.2.0㎜

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