There is a new movie Invisible guest(看不见的客人) on show. Li Hua and her parents will watch it. They can go there airy day. Please help her work out which is the lowest price for them.

Invisible guest Tuesday evening￥60                 Sunday￥80 If you have a student card, you can have a discount of 40% off If there are three persons, you can have a family price 132 for three(except weekends)

在Photoshop中，如果将“容差”值由25增加到30，用魔棒点击图片上同一位置进行选区，改变容差后获得的选区一般将（   ）

下列实验操作能达到预期目的是（   ）

— What are you going to do if it______ tomorrow?

—I haven't thought about it.

将10g碳酸钙固体高温煅烧一段时间，冷却后投入足量稀盐酸中完全反应，有关结论错误的是（　　）