JT/T 33.31-93 Technical grade standards for workers in the communications industry-Communications engineering-Piling workers on ship. 1主题内容与适用范围 JT/T

JT/T 33.32-93 Techntcal grade standards for workers in the communications industry-Communicatlons engineering-Crane workers on ship. 1主题内容 与适用范围 JT/T

JT/T 33.19-93 Technical grade standards for workers in the communications industry-Communications engineering-Operating workers of scraper. 1主 题内容与适用范

JT/T 33.20-93 Technical grade standards for workers in the communications industry-Communications engineering-Operating workers of excavator. 1主题内容 与适

JT/T 33.21-93 Technlcal grade standards for workers in the communications industry-Communications engineering-Operating workers of mineral mixing equi

JT/T 33.22-93 Technical grade standards for workers in the communications industry-Communicntions engineering-Operating workers of crane. 1主题内容与适用范圈 J

JT/T 33.23-93 Technical grade standards for workers in the communications industry Communications engineering-Operating workers of medium and small si

JT/T 33.24-93 Technical grade standards for workers in the communications industry-Communications engineering-Operating workers of asphalt and concret

JT/T 33.25-93 Technical grade standards for workers in the communications industry-Communications engineering-Operating workers of soil stabilizer mlx

JT/T 33.26-93 Technical grade standards for workers in the communications industry-Communications engineering-Operating workers of asphalt and concret