What devices are included and how much testing and maintenance is required?

应该包括那些设备以及多少检测和维护较合理？

youdao

The other parts of the system where maintenance is required are the diaphragm valves.

系统的其它部分的维护如隔膜阀的维护也是必须的。

youdao

When maintenance is required, it can be performed easily at the hydrant or at any other convenient location.

如果需要进行维护，则很容易在消防栓或任何其他方便的位置进行。

youdao

The council said maintenance work is required on the centre's heating system, roof and kitchen.

BBC: Middleton Centre may be closed by Durham County Council

The depth of the inspections required is based in part on the maintenance status of the aircraft under consideration.

FORBES: What's The Best Jet For You? (Part 3)

The reason reversing such gains is hard is that servicing this extra flesh means a person's maintenance diet (the food required to keep his body ticking over) creeps up with his weight and so does his appetite.

ECONOMIST: The difficulty of losing weight is captured in a new model