In April, the weather in some places in Shanxi was really changeable. People still remember they have _______ four seasons in a week.
如图，已知AB=DC，若要用“SSS”判定△ABC≌△DCB，应添加条件是____ ．
关于亚洲气候复杂多样原因的叙述，错误的是 （ ）
有____个直角．
