The study of the relationship between productivity and living standards is significant in
A. it calls policymakers' attention to a qualified work force
B. it encourages workers to get better education
C. it helps improve the workers' ability to produce goods and services
D. it enables policymakers to access the latest technology
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《电气装置安装工程高压电器施工及验收规范》规定，六氟化硫断路器基础的中心距离及高度的误差不应大于()。
A. 3 mm
B. 10 mm
C. 5 mm
D. 12 mm
______in a simple style, the book clearly describes the author's childhood experiences in
A. Writing
B. To be written
C. Being written
D. Written
《建设工程质量管理条例》规定，电气管线、给水排水管道、设备安装工程保修期为()。
A. 10个月
B. 18个月
C. 1年
D. 2年
是以集中的高速电子轰击工件表面所产生的热能进行焊接的方法。
A. 激光焊
B. 电子束焊
C. 电阻焊
D. 等离子弧焊
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