在区间线路上进行不影响行车安全的作业，应在作业地段两端500～1000m处列车运行方

目前便携式电脑的配置已经______桌面式电脑。

短文改错/Proofreading and error correction

It was the chance of a lifetime to win the first prize on the Story Writing Show. All I had to do was to write a story or present it. My teachers have been telling me how great my writing was. So if they had said was true, I would have a chance of winning the prize. What were better, I had useful help. There was Uncle Chen, gentleman living near my house, who was a very much famous writer. He agreed to reading my story and give me some advices on how to write like a real writer.

6（）

关于皮肤肿瘤下列叙述错误的是（）

A.基底细胞瘤极不容易转移

B.基底细胞瘤好发于面部

C.鳞癌不会在烧伤等瘢痕上发病

D.砷剂为皮肤原位癌的发病原因之一

E.着色性干皮病容易发生皮肤肿瘤

地址重复是怎么回事？

溴冷机运行中产生的不凝性气体，一般大多聚集在一个热交换器的底部，这个热交换器是（）。

A.发生器

B.冷凝器

C.蒸发器

D.吸收器