在Visual FoxPro中，程序文件的扩展名为（ ）。A．数据的规范化 B．

In autumn of 1935, when I was a young man, I was traveling in the north of Indian. One evening, before hunting in the forest all day, I was returning to the place which I had put up my tent. It was getting dark, but I was walking along a road. Suddenly I saw two eye glaring at me from among the trees. How could I do? Should I jump into the river to save my life? Then I look to the right. In the river there had a big crocodile waiting to welcome me with its mouth was wide opening.  

在括号里填上适当的数。    

5平方米10平方分米=（  ）平方米                     4千米50米=（  ）千米    

2.05吨=（  ）吨（  ）千克                                6.8米=（  ）米（  ）厘米

A319/A320机型配备的《安全须知》有几种版本（）.

A、一种

B、两种

C、三种

D、四种

农业航空

造成惰气含氧量高的机械故障原因可能是（）。

A.洗涤海水压力不能满足需要，洗涤冷却效果差

B.甲板水封装置工作不正常

C.主喷油嘴位置安装不对，燃油压力太低