A. He hasn’t any tickets for the football match. B. He hasn’t got any tickets for the football match. C. He doesn’t has any tickets for the football match.
A. 正确 B. 错误
A. 质量流量计应安装在无振动的管道上 B. 质量流量计的安装方向应与外壳箭头方向一致 C. 质量流量计安装时应有足够长的前后直管段 D. 质量流量计安装时工艺管道不应对表体有应力