改变拘束距离和板厚，可以调节焊件拘束度的大小，当拘束距离越小，板厚越大时，则拘束度（）
A.越小
B.越大
C.不变
D.为零
参考答案：B
根据首字母提示完成单词拼写。
1. If you make so much noise, you may d______ others.
2. It is out duty to take part in p____ our environment.
3. Can you t____ this English sentence into Chinese.
4. It is important for you to buy a g______ book, when you learn a foreign language.
5. An SOS Children's Village gives help to the h____ children.
若一个三角形的所有边长都是整数，其周长是偶数，且已知其中的两边长分别为10和2000，则满足条件的三角形总个数是( )。
A．10 B．7 C．8 D．9
