布料：衣服 A．字典：查阅 B．烟草：香烟 C．喇叭：音响 D．门：窗

根据句意及图片的提示，补全单词。

        1题                      2题                    3题                4题                     5题

1. We have known that the hand-held ____was invented in 1971.

2. The____ sneakers that were invented by Julie Thompson are used for seeing in the dark.

3. I used three      of flour and one of sugar.

4. The light ____ gives people more time to work and play every day.

5. In summer, many students really like wearing____ at home.

My best friend often helps my brother and ______ with ______ math. [ ]

A. I; our

B. me; our

C. me; my

D. I; mine

钢回火的目的是为了减少或消除工件淬火时产生的内应力，防止工件在使用过程中变形和开裂。

螺栓螺纹在连接件的孔内部分不少于（）螺距。

A、2

B、3

C、4

D、5

非精密进近程序，当飞机下降到最低下降高（MDH）时，如果不能建立目视参考，应：（）.

A.立即复飞

B.继续下降直到找到目视参考

C.保持最低下降高飞行

D.保持最低下降高至复飞点，如果仍未找到目视参考，应复飞