The Expression and Immune Response Characteristics of TLR2 at the Early Development Stage of Rana chensinensis Acute toxicity of Cu2+ to Rana chensinensis tadpole Adaptability of abnormal tadpole (Rana chensinensis) to water pH,salinity and alkalinity in Changbai Mountain of China Preliminary studies on the relative fatness and weight/length of wild and domestic Rana chensinensis from Liaoning