【单选题】维生素C缺乏时又称 ,表现为毛细血管脆弱,皮下出血;牙龈出血、溃烂等
【单选题】我国于( )年成为世界知识产权组织(WIPO)的正式成员国。
【简答题】三极管处于放大状态时,发射极处于()状态,集电极处于()状态。
【单选题】我国于( )成为世界知识产权组织(WIPO)的正式成员国。
【简答题】我国于何时成为世界知识产权组织(WIPO)的正式成员国?
【单选题】The giant panda is an animal unique to China, and Wolong in Sichuan Province is one of the few places in China where ______.
C.
lives the giant panda C. does the giant live C. the giant panda is living
【单选题】The exhibition ______ such enered animals as the giant panda and the Siberian tiger and describes the work being done to protect them.