已知△ABC≌△DEF，BC对应EF，BC=8cm，EF的边长是______．
∵△ABC≌△DEF，
∴EF=BC=8cm．
故答案为：8cm．
选词填空。
1. Look at _____ (my me) clock.
2. It's time _____ (for to) math class.
3. Where is the _____ (shorts short) hand?
4. Can I _____ (has have) a look?
5. It's time _____ (to for) get up.
球形油膜式燃烧室是利用强烈的（）将燃油均匀喷涂在室壁上，并形成一层油膜。
A.对流空气
B.进气压力
C.进气旋涡
D.进气压强
