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【简答题】
If you’re dreaming of a White Christmas, the dream may be as close as you get. It’s the season for unseasonably (1) ________ temperature in the U.S. With 321 million people, it’s the world’s third most populated country. Over the weekend, 75 percent of that (2) _________ felt temperatures greater than 60 degrees Fahrenheit. That’s more like late September than mid-December. Meteorologists are (3) __________ El Nino. It’s a natural phenomenon caused by warm temperatures over the Pacific Ocean, and it can affect weather patterns around the world, (4) __________ in the U.S. It’s keeping cold air bottled up in the Arctic, instead of spilling south. Nearly the entire country is asking the same (5) ________, where is winter? Who took it? That would be El Nino. Where is win ter? That’s exactly what we’d (6) ________ in a very strong El Nino year. If we (7) _________ 1982, 1997, what happened in those years, exactly this—much warmer than normal temperatures across the (8) _________ half of the United States. Last year, Buffalo had “Snow-vember”. This year, not a flake on the (9) _________. And although January and February shape up the same above normal, above normal if your normal is 15, is still cold enough to make big snow. This is (10) ________ an El Nino pattern, a very strong El Nino pattern. Warmer than normal across the north, cooler than normal across parts of the south, and still wetter than normal across the southwest. But where’s the winter? Right now, it’s nowhere to be found.
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举一反三
【多选题】一般来说,商事登记主要有()种类。
A.
创业登记
B.
设立登记
C.
变更登记
D.
注销登记
【判断题】在新古典增长理论框架内,稳态状态意味着:△Y/Y=△N/N=△K/K。(Y是产出,N是劳动,K是资本)( )
A.
正确
B.
错误
【单选题】下列关于RNA的叙述,正确的是
A.
RNA分子无双螺旋结构
B.
碱基互补配对方式是:A与T,G与C
C.
RNA分子一般较DNA分子大
D.
RNA一定要形成高级结构才能发挥其活性
E.
RNA分子不含稀有碱基
【多选题】入侵探测器的主要技术性能指标有()
A.
误报率
B.
漏报率
C.
探测范围
D.
探测灵敏度
E.
供电与备用电源
【简答题】简单叙述液压千斤顶的传动原理?
【单选题】下列有关DNA分子的叙述,正确的是
A.
在环状DNA分子结构中,每个脱氧核糖均与一个磷酸相连
B.
DNA的碱基数等于该DNA上所有基因的碱基数之和
C.
DNA分子进行转录时,RNA聚合酶的结合位点位于RNA上
D.
具有a个腺嘌呤的DNA片段,第n次复制需 个腺嘌呤
【单选题】在新古典增长理论框架内,稳定状态意味着:△Y/Y=△N/N=△K/K。(Y:产量;N:劳动;K:资本)
A.
正确
B.
错误
【判断题】寓言最初源于动物故事。
A.
正确
B.
错误
【单选题】下列有关叙述正确的是
A.
无论是 DNA 还是 RNA ,其彻底水解的最终产物均为 4 种
B.
脱氧核苷酸之间的连接方式与核糖核苷酸之间的相同
C.
DNA 通常为双链,其一条链上相邻碱基之间可通过氢键相连
D.
RNA 通常为单链,其链上的碱基之间无法通过氢键相连
【单选题】对下列有关细胞中三种RNA的叙述,正确的是
A.
组成三种RNA的碱基有腺嘌呤、鸟嘌呤、胸腺嘧啶和胞嘧啶
B.
原核细胞的rRNA的合成需要核仁的参与
C.
三种RNA中只有mRNA是以DNA的一条链为模板转录合成的
D.
三种RNA结构不同,功能不同。
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