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【单选题】
主备模式的OMNI 6000之间的通讯可在OMNI 6000流量计算机的串行口上采用（）的通讯方式，此通讯遵照MODBUS协议，波特率可达19.2KA.
RS422 TO RS422
B.
RS232 TO RS232
C.
PEER TO PEER
D.
DH+TODH+
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举一反三
【多选题】描述原子核的液滴模型是一种早期原子核模型。它主要通过与液滴性质的对比，考虑了原子核的以下哪些性质
A.
不可压缩性
B.
表面张力
C.
质子带电
D.
同位素的结合能随着中子数会变化
【多选题】What is Lesch-Nyhan syndrome ?
A.
A genetic lack of hypoxanthine-guanine phosphoribosyltransferase (HGPRT) activity, seen almost exclusively in young boys, results in a bizarre set of symptoms called Lesch-Nyhan syndrome.
B.
Children with this genetic disorder, which becomes manifest by the age of 2 years, are sometimes poorly coordinated and have intellectual deficits. In addition, they are extremely hostile and show compulsive self-destructive tendencies: they mutilate themselves by biting off their fingers, toes, and lips.
C.
The devastating effects of Lesch-Nyhan syndrome illustrate the importance of the salvage pathways. Hypoxanthine and guanine arise constantly from the breakdown of nucleic acids. In the absence of HGPRT , PRPP levels rise and purines are overproduced by the de novo pathway, resulting in high levels of uric acid production and goutlike damage to tissue.
D.
The brain is especially dependent on the salvage pathways, and this may account for the central nervous system damage in children with Lesch-Nyhan syndrome. This syndrome is another potential target for gene therapy.
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