化学符号及含义正确的是 [ ] A.氦气:He2 B.2个氮分子:2N2 C.氧

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问题:

化学符号及含义正确的是 [ ]

A.氦气:He2

B.2个氮分子:2N2

C.氧化镁:Mg2O2

D.生石灰:Ca(OH)2

考点:化学式的写法和意义
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女性,52岁,消瘦、吞咽困难2月余,伴心悸、气短、双下肢水肿。查体:口唇发绀,心尖部舒张期隆隆样杂音,S1亢进,二尖瓣开放拍击音明显,肺动脉瓣区S2亢进分裂。

该患者最可能的诊断是()

A.肺源性心脏病

B.风心病

C.更年期综合征

D.心包积液

E.慢性肾炎

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As always, I am pleased to be here at the National Press Club for my (1) Speech. This is the seventh time I have had the (2) to give this speech, and over the years I have talked about a wide range of issues: (3) , reading, setting high expectations, improving the teaching profession, and (4) the American high school -- to name just a few.
I have just returned from a five-day, (5) tour of schools in rural America. We started in Monroe, Louisiana, and finished (6) later in Paducah, Kentucky. What I noticed most about the trip was the weather. Every time I (7) my Success Express School Bus, the local people who came to greet me (8) that the record for (9) had just been broken in their community. In each place, the temperature was always between (10) degrees.
Now, I have very good people on my staff. But the next time we plan a (11) , I’m going to have a (12) on my staff. I took this bus trip through rural America to make an important point that the (13) of children in our nation’s small towns cannot be ignored. Twenty-five percent of all our school children live in (14) all over America.
When it comes to our children, let’s always remember that children everywhere have (15) and (16) . Yet, schools in small towns too often have to (17) because of limited resources and a (18) . On my trip I put a p focus on the issues that matter in rural America, with a particular emphasis on (19) schools, reducing class size, and overcoming the (20) .

题型:选择题

邓 * * 在( )年曾经指出:“经济建设这一手我们搞得相当有成绩,形势喜人,这是我们国家的成功,但风气如果坏下去,经济搞成功又有什么意义会在另一方面变质,反过来影响整个经济变质,发展不下去会形成贪污、盗窃、贿赂横行的世界”。这段话所强调的是两个文明要一起抓是很必有必要的。

A.1986

B.1987

C.1988

D.1989

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延胡索的主要镇痛、镇静成分为()

A.去氢延胡索甲素

B.延胡索乙素

C.挥发油

D.香豆素类

E.生物碱类

题型:选择题

水中溶解氧的含量与()有关。

A、空气中氧的分压

B、大气压力

C、水温

D、水中含盐量

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