But as well as the applicaton of horizontal continuous casting billets , the amount of disfigurement of pierced shell inner and outer fold is increasing apparently,especially the outer fold is the very seriousone.

On the basical characteristics of two historical and great transitions;

Several hypotheses on the corrosion transition phenomenon of zircaloy are presented.

The spirit of "freedom,revolution"contained in subject of the works,is inevitable in accidental! Hero symbolized the style of Beethoven s symphony had come to maturity,which was a transition of the symphony history and a transition of the western music history too.

The Historical Turning of China's Wood Industry;

The results show: ended the yearly ascending tendency,the long term variation of F and Z component showed a turning respectively in 1999 and 2000,but recovered a little in some local region in recent two years;with a descending tendency,the H component did not change.

Results indicate that total ozone decreases persistently and has a turning point during its decline over northern and southern polar regions in recent decades.