Our survey not only proved Bohai Bay is a important stopover of Eurasian Curlew (Numenius arquata), Grey Plover (Pluvialis squatarola) and Dunlin (Calidris alpina) but also discovered there is used as nonbreeding area by these three shorebirds at the first time.

This research aimed to study the foraging characteristics of C.

The existence of grey spot may cause brittle crack of the joint,therefore,controlling grey spot occupy a decisive position to ensure the quality of rail resistance welding.

The microstructure and forming mechanism of“grey spot”in the nodularcast iron roll has been studied,“ grey spot”Concept has been perfected.

The research results indicated that the gray spots in a crankshaft made of ductile cast iron with pearlite matrix can be efficiently overcome by using the low rear earth spheroidization agent with the antimony,lower content of silicon and a middle content of carbon,decreasing the sulphur content of the iron liquid,and avoiding the disturbance elements in the charg

Intercropping of Resistant and Susceptible Soybean Varieties to Improve Resistance to Cercospora Sojina Hara of Susceptible Soybean Varieties;

Study on The Effects and Benefits in The Process of Controlling Cercospora sojina Hara by Fungicide;

Studies on the soluble sugar content in soybean leaves of resistant and susceptible cultivars to Cercospora sojina Hara;