PGM-48钢轨打磨车有2台主发动机,每台功率为()千瓦。
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交流接触器铁芯端部分截面上的短路铜环的作用是()
A. 消除100Hz的低频噪声
B. 减小涡流损失
C. 增大吸合力
D. 使衔释放时触头间不产生电弧
国家统计局应当建立健全统计数据质量监控和评估制度,加强对各省、自治区、直辖市重要统计数据的监控和评估。()
A. 正确
B. 错误
The claim for dead freight being a claim for damages for breach of contract,the Shipowner is under a duty,where the Charterer fails to load a full and complete cargo,()the damage by obtaining other cargo,provided he acts reasonably in so doing.
A. to minimize
B. minimizing
C. minimized
D. have minimized