Each fire pump on a tanker must have a pressure gauge located at（）. the pump discharge。 the manifold connection。 each fire station discharge。 the pump statio。
什么是配电变压器的“三位一体”接地方式？为什么采用这种接地方式？
空压机运行中如油压降低至0．05MPa立即停车检修。
Which of the listed conditions will affective pressure the most in the cylinder of a diesel engine?（） TBN of the lubricating oil。 Temperature of the lube oil。 Completeness in the mixing of the fuel and air。 Temperature of the cooling (sea) water。
配电网中装设消弧线圈的目的是什么？消弧线圈有哪几种补偿方式？
加工路线单的优点有（）。
