地图的三要素是（　　）

某科研小组以难溶性钾长石（K₂O•Al₂O₃•6SiO₂）为原料，提取Al₂O₃、K₂CO₃等物质，工艺流程如下：

根据句子意思和所给的首字母写出所缺单词。要求在答题卷上写出完整的单词。（每空只写一词）
Most people will feel h____  when they are away from their homes for a long time.
Whether to go or not. It’s difficult for me to make a d____ 
We hope our f____  will last forever.
He works hard every day. I think he will a____  his ambition one day.
The student not only learn k____ from the textbooks but also from different activities.

如图所示，一木块放在水平桌面上，在水平方向共受到三个力（即F₁、F₂和摩擦力）作用，木块处于静止状态，其中F₁＝10N、F₂＝2N。若撤去力F₁，则木块在水平方向受到的合力和摩擦力为（    ）