The safety demonstrations for powder material conveying systems on Daqing Petrochemical Company LLDPE units are conducted.
针对大庆石化分公司线性低密度聚乙烯装置粉料输送系统进行安全性论证。
Flight attendants on many airlines have also added a warning about the Samsung devices during pre-flight safety demonstrations.
许多航空公司的空姐在飞行前安全示范期间，还增加了一条对三星手机的警告。
Flight attendants on many airlines have also added a warning about the Samsung devices during pre-flight safety demonstrations.
许多航空公司的空姐在飞行前安全示范期间，还增加了一条对三星手机的警告。
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