When you go to bed and when you get up are keystones to restful , refreshing sleep .
何时睡觉和何时起床是获得使人休息充分、精神焕发的睡眠的关键。
In this paper , it has modified the np problems ( course arrangement ) with ga , and explained the keystones , ideology , techniques difficult , solving scheme of system design .
The keystones and components of pcr and its applications in the study of insect resistance , environmental toxicology of pesticide , mechanism of pesticide and the exploitation of bio-pesticides are introduced in this paper .
