按照需求的判定以及相对应的管理方式的不同，需求被分为（）。
A.独立需求
B.非独立需求
C.相关需求
D.非相关需求
参考答案：A, C
根据所给单词，写出正确的形式.
1. Does Tom have to (do) his homework by five o'clock?
2. She practices (play) the piano every day.
3. We often go to the (child) Palace after school.
4. Don't (eat) in the classroom,Emily.
5. The people here are very (friend).
注射模浇口的作用是什么？有哪些类型？各自用在哪些场合？
