[单项选择]关于预防尘毒危害八字方针的描述中，错误的是（）
A. 湿式作业是控制矿物性粉尘飞扬的根本措施
B. 技术革命和技术革新是控制尘毒危害的根本措施
C. "八字"方针是指"革、水、密、风、护、教、管、查"
D. 局部通风是使用最广泛的通风技术
E. 当采用环境控制仍不能消除职业有害因素对人体危害时，加强个体防护

Wish little service productivity growth, the principal way of expanding output has been to add more bodies. Politicians love to take credit{{U}} (31) {{/U}}an 18. 2 million increase in jobs in this decade,{{U}} (32) {{/U}}in the service businesses firms essentially have been digging the Grand Canyon with millions of people equipped only with picks and shovels-more production but achieved by the brute-force technique of adding bodies, rather{{U}} (33) {{/U}}by improving efficiency.
The opportunities{{U}} (34) {{/U}}improve service productivity through office automation, better management, etc. are tremendous, even{{U}} (35) {{/U}}an increase in the skills of the rank and file. The pressure to get that improvement will come from the customers, themselves facing excruciating global competition.