【单选题】电压互感器有两种:电容式电压互感器与电磁式电压互感器,其中暂态特性较差的是()电压互感器。
【单选题】, Which of the following statement is wrong regarding the de novo synthesis of purine nucleotides:
A.
IMP is first synthesized, and then branched into synthesis of AMP and GMP.
B.
Substrate ribose-5-phosphate in the salvage pathway of nucleotide synthesis is provided by 5-phosphoribosyl-1-pyrophosphate.
C.
Both of the synthesis of 5-phosphoribosyl-1-pyrophosphate (PRPP) and 5-phosphoribosyl-1 amine (PRA) are regulatory points in the de novo synthesis of purine nucleotides.
D.
The synthesis of 5-phosphoribosyl-1 amine (PRA) is the committed step in the de novo synthesis of purine nucleotides.
E.
It is the least important pathway for purine nucleotide synthesis.
【单选题】砂有I类、II类、III类三个级别,,III类砂宜用于( )。
【单选题】作出 “我们党领导人民进行社会主义建设,有改革开放前和改革开放后两个时期,这是两个相互联系又有重大区别的时期,但本质上都是我们党领导人民进行社会建设的实践探索。中国特色社会主义是在改革开放历史新时期开创的,但也是在新中国已经建立起社会主义基本制度,进行了 20 多年建设的基础上开创的。”这一论述的是( )。
【单选题】Qu'est-ce qu'il aime faire ?
A.
Il aime faire du sport.
B.
Il aime fait du sport.
C.
Il aimer faire du sport.
D.
Il aime fais du sport.
【单选题】The linkage between nucleotides is ( ) .
A.
2’,-3’ phosphodiester bond
B.
3’,-5’ phosphodiester bond
C.
. 2’,-5’ phosphodiester bond
【单选题】听力原文: Police in London have warned people to remain cautious following the bomb attacks during Thursday morning's rush hour on the city's transport system. The attacks are believed to have killed at l...