[判断题]遇有降雾、暴风雨（雪）、扬沙等恶劣天气影响了望时，应停止线上作业和上道检查。必须作业时，应采取特殊安全措施，保证来车之前按规定的距离及时下道。
A.正确
B.错误

Before the widespread use of computers, managers could not make full use of large amounts of valuable information about a company’s activities. The information either reached managers too late or was too expensive to be used. Today, managers are facing a wide range of data processing (数据处理) and information instruments. In place of a few financial controls, managers can draw on computer-based information systems to control activities in every area of their company. On any kind of performance measures, the information provided by these systems helps managers compare standards with actual results, find out problems, and take action before it is too late to make changes.
The introduction of computerized information system has sharply changed management control in many companies. Even a neighborhood shopkeeper may now use computers to control sales, billing, and other activities. In large companies, electronic data processing systems monitor entire projects and s
A. The introduction of microcomputers in the United States has changed management control in many American companies.
B. There is one microcomputer for every 10 citizens in the United States.
C. It is not necessary for the managers to learn how to program computers.
D. There are about 24 million people using microcomputers in the United States.