什么是精馏塔液泛和淹塔?

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问题:

什么是精馏塔液泛和淹塔?

考点:甲醇装置操作工甲醇精馏甲醇精馏题库
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下列命题不正确的是(  )

A.若a>b>0,则log2a+log3b>log2b+log3a

B.若log2a+log3b>log2b+log3a,则a>b>0

C.若a>b>2013,则2a-log2a>2b-log2b

D.若2a-log2a>2b-log2b,则a>b>2013

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阅读古诗李白《渡荆门送别》,完成小题。(4分)

渡荆门送别

渡远荆门外,来从楚国游。

山随平野尽,江入大荒流。

月下飞天镜,云生结海楼。

仍怜故乡水,万里送行舟。

小题1:诗的颈联通过两幅美丽的画面来形容江上的美景,第一幅是       图,写夜间的风景;第二幅是     图,写黄昏的风景。这么美的景色,真让人陶醉!(2分)

小题2:这首诗融情于景,抒发了诗人一种什么情感?(2分)

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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.

18().

A.since 

B.after 

C.while 

D.until

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某建筑物相对标高±0.000=30.500,且设计楼顶标高60.000m,则其楼顶的绝对标高为( )。

A.30.500
B.60.500
C.90.500
D.98.500

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对接转载机桥部溜槽时,桥部开始是()。

A.凹型槽

B.凸型槽

C.普通槽

D.过渡槽

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