阅读下面材料，在空白处填入适当的内容(1个单词)或括号内单词的正确形式。

      “Equal pay for equal work” is a phrase by the American women who feel they are ____ (fair) treated by society.They think it is not right for women to be paid less than men for the____ amount of work.Some people say men have ____  (many) duties than women.A married man has to earn money to support his family and make important ____ (decide)，so it is right for them to be paid more.Some are even against married women ____ (work) at all.When wives go out to work，they say，the home and children are given no attention ____ ．If women are encouraged by equal pay to take up jobs，they will be ____ (able) to do the things that they are best at doing：making a nice home and bringing ____ children.Women who disagree say that they want to escape from the limited place which society wishes them to fill and have ____ freedom to choose between a job and home life，____ a mixture of the two.In fact women have the right not only to equal pay but also to equal chances.

阅读下文，回答相关问题

      建中四年，项城为叛军困。县令李侃，不知所为。其妻杨氏曰：“君，县令也。寇至当守；力不足，死焉，职也。君如逃，则人谁肯固矣!”侃日：“兵与财皆无，将若何”曰：“如不守，县为贼所得矣，仓廪皆其积也，府库皆其财也，百姓皆其战士也，国家何有?夺贼之财而食其食，重赏以令死士，其必济!”
      于是，召胥吏、百姓于庭，杨氏言曰：“县令，诚主也；虽然，岁满则罢去。非若吏人、百姓然。吏人、百姓，邑人也，坟墓存焉，宜相与致死以守其邑，忍失其身而为贼之人耶？”众皆泣。得数百人，侃率之以乘城。
      项城，小邑也，无长戟劲弩、高城深沟之固。贼气吞焉，将超城而下。有以弱弓射贼者，中其帅，坠马死。贼失势，遂散走，项城之人无伤焉。

已知 $\overrightarrow{OA}=\left(1,1,0\right)$ ， $\overrightarrow{OB}=\left(4,1,0\right)$ ， $\overrightarrow{OC}=\left(4,5,-1\right)$ ，则向量 $\overrightarrow{AB}$ 和 $\overrightarrow{AC}$ 的夹角的余弦值为（   ）

李明等几位同学准备探究“弹簧弹性势能的大小与什么因素有关”．同学们猜想：弹簧弹性势能可能与弹簧长度变化量和弹簧粗细有关．他们设计的实验装置如图，弹簧左端固定在墙上，放在水平面上，水平面A点左侧光滑，右侧粗糙．物体P压缩弹簧到B点后从静止释放，运动到C点弹簧恢复到原长与物体脱离，物体运动到D点停止．请补充完成他们的探究过程：

（1）对同一根弹簧，物体P压缩弹簧至B点，从静止释放，运动到D点．测量____ 之间的距离和____ 之间的距离，并改变____ 之间的距离，测多组数据，分析数据得到：弹簧长度变化量越大，弹性势能越大．

（2）对原长相同、只有粗细不同的两根弹簧，物体P分别压缩弹簧至同一位置B点，从静止释放，运动到D点．分别测量____ 之间的距离，改变压缩量，重复试验，分析数据得到：弹性势能与弹簧粗细有关．