长方形的周长=______.
因为长方形有2组长和宽,每组都相等,
所以求出其中一组再乘以2即可,
即长方形的周长=(长+宽)×2.
故答案为:(长+宽)×2.
血清胃泌素水平增高见于()。
A.慢性浅表性胃炎
B.急性胆囊炎
C.急性水肿型胰腺炎(轻症)
D.急性坏死型胰腺炎(重症)
E.慢性胰腺炎
根据题意及首字母提示填空。
1. Elephants are the most e______ animals in the world.
2. That zoo is s______ for animals to live in.
3. It's important to r______ paper to save the trees.
4. Most people are a______ putting animals in the zoo.
5. The a______ animals should be put in cages.