如图所示，放在桌面上的饮料瓶子，内部剩有饮料。瓶盖旋紧后倒过来时，液体对瓶塞的压强比正放时液体对瓶底的压强____（选填“大”或“小”），瓶子对桌面的压力____（选填“增大”、“变小”或“不变”）。

根据短文理解，完成下列各题。

    This is our school. There is a very nice 1 in our school. It is big and bright（明亮的）. It has all 2 of books and newspapers in it. We can 3story books, picture books, English books and many 4 books there. We can 5 do some reading there. Maria likes reading very much. She goes to the library every day. Look, she 6 and reading by the window (窗口). Li Ming 7 borrows some books and reads them in it. He likes books.

    I'm going to borrow an 8 story book. Our English teacher often 9 us to do more speaking and reading. I like English very much. I 10 I can do well in English. What about your school?

如图所示该压路机在沥青路面辗压时，压路机对水平路面的压  强为2×10⁵帕，压路机对水平路面的压力为多少牛？压路机与路面的接触面积为多少米²？

对平面上任意一点（a，b），定义f，g两种变换：f（a，b）=（a，﹣b）．如f（1，2）=（1，﹣2）；g（a，b）=（b，a）．如g（1，2）=（2，1）．据此得g（f（5，﹣9））=(      )