Longman preparation series for the new toeic test part 31

Chia sẻ: Tran Anh Phuong | Ngày: | Loại File: PDF | Số trang:8

0
90
lượt xem
26
download

Longman preparation series for the new toeic test part 31

Mô tả tài liệu
  Download Vui lòng tải xuống để xem tài liệu đầy đủ

Most pipelines are operated twenty-four hours a day from a control station, using telephone, satellite, or microwave communications systems. Computers are widely used to monitor conditions along the line every ten to sixty seconds, sounding an alarm if they detect any abnormality or sudden change in pressure. In the event of an alarm, valves can be closed and nearby pipeline crews dispatched within minutes.

Chủ đề:
Lưu

Nội dung Text: Longman preparation series for the new toeic test part 31

CÓ THỂ BẠN MUỐN DOWNLOAD

Đồng bộ tài khoản