This paper analyses the cause of early fracture of 20MnSi bars in tensile test by the methods of metallographic and scanning electron microscopes.

The early fracture of base cylinder for motorcycle vibration absorber was analyzed by electron probe microanalyzer(EPMA) and optical microscope.

When a blade is given to the scissors by abrasive wheel,the extremelly thick chromium-plating layer will carck and desquamate,thus leading to early fracture of surgical scissors in service.

Cytological study on fertilization and early cleavage in Barnea dilatata

(3 ) To analysis the relationship between the early cleavage and the quality of embryos.

Early cleavage rate,embryo quality,the rate of blastocyst,implantation and pregnant rates from these zygotes were observed,and the transferred embryos were selected according to the pronuclei orientation and early cleavage time.

Analysis of early cracks in cement concrete pavement of expressway and their prevention;

Estimation for early crack of concrete;

Causes and prevention of the early cracks in concrete structure;

Analysis and calculation of temperature influence on the early stage crack of concrete wall;

The early stage crack and drying shrinkage crack of self-compaction concrete and pump concrete with water binder ratio is 0.

Analysis on prevention of early cracks in cement concrete pavement;

Owing to the early cracks in the premixed concrete,the paper analyzes its cause in terms ofproduction and construction and puts forward the countermeasures to be taken in the control pf production process.