酸化液中的添加剂主要有哪些？
参考答案：
①缓蚀剂；②铁离子稳定剂；③粘土防膨剂；④互溶剂；⑤暂堵剂；⑥消泡剂。
用所给动词的正确时态填空。
1.It takes about an hour _____(go) to Changzhou by bus.
2.He left home without _____(tell) his mother.
3.My sister seldom _____(play)volleyball now .
4.Look ! Lily's cat _____ (lie)on the sofa comfortably .
5.It's time for us _____(exercise) now .
6.I am planning _____ (take) a holiday to the USA.
电瓶叉车与内燃叉车相比的特点是：结构复杂，操作方便，起步平稳，污染少，噪声小。
