燃烧需要具备的三个条件是()。
A.燃料、空气、锅炉;
B.可燃物质、催化剂、氧气;
C.可燃烧的物质、助燃的氧气、足够高的温度;
D.锅炉、风机、燃煤。
参考答案:C
When you get involved in sports, a lot of racial____are broken down because players developed friendship quickly.
A.barriers
B.threats
C.approaches
D.hardships
我国侗族日常主要食品包括()
A、米饭
B、酸鱼
C、酸菜
D、油茶