在安装机械密封过程中，不允许用工具（）密封元件以防止密封件被损坏。
A、接触
B、敲打
C、运送
D、安装
参考答案：B
用所给单词的适当形式填空。
1. The child ______ ______ (not like) the new doll.
2. ______ (we) school is very beautiful.
3. Why do you buy so many books? I don't like ______(they).
4. He likes swimming, and he is a good ______ (swim).
5. What do you ______ (usual) do on your birthday?
固体饮料
