轴拉构件配有两种不同面积和不同等级的钢筋，混凝土开裂后，钢筋应力增量的变化是（）。

A．强度高的钢筋应力增量大

B．两种钢筋应力增量相等

C．E_s大的钢筋应力增量大

D．A小的钢筋应力增量大

根据信的内容及所给首字母完成这封信中所缺的单词。

Dear Mother,

     Can you bring some (1) t________ to school? I need my math book, my baseball, my (2) n________,

CDs and my video (3) c________. (4) M________ math book is (5) o________ the dresser.

The (6) b________ is under the bed.The notebook is (7)n________ to the baseball (8) u________ the

bed. The CDs (9) a________ in the drawer.The video cassette is (10) b________ the computer.

      Thanks

                                                                                                                                         Sally