在△ABC中，若A=60°，C=45°，b=4，则此三角形的最小边是____．
从12个同类产品（其中10个是正品，2个是次品）中任意抽取3个，
（1）3个都是正品；
（2）至少有1个是次品；
（3）3个都是次品；
（4）至少有1个是正品，
上述四个事件中为必然事件的是____ （写出所有满足要求的事件的编号）
根据提示写出相应的历史事件
____
This boy is Peter .He is from America．He is ten years old . His hair is yellow.Peter can play basketball. This is his school.It's very big. There are forty students in his class. Miss White is his English teacher. Peter is good at English.
