原料油管线用蒸汽进行吹扫时,需经过暖管后才能进行吹扫,防止产生水击。
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()is the way to deliver goods for different shippers in the same truck, by the most economic route.
A. Joint Distribution
B. United Distribution
C. Multiple Delivery
D. Joint Delivery
封闭式组合电器引出电缆备用孔或母线的终端备用孔应用专用器具封闭。()
A. 正确
B. 错误