偏心受压构件的偏心距过大，构件的承载力明显（），既不经济又不合理。另外，偏心距过大，可使截面受拉边出现过大（），给人以不安全感。

句型转换。

1.That's his cousin. (改为复数句子)

    _______________

2.This is my mother and this is my father. (改为同义句)

   These ______ my ______ .

3.She is my uncle's daughter. (改为同义句)

   She ______ my ______.

4.These are my books. (改为否定句)

   These _____  ______  my books.