The compressed air is admitted to each cylinder through a cam operated by starting air valve when the piston has just passed its （）.

The complete assembly of bedplate, A-frames and cylinde...

单项选择题The complete assembly of bedplate, A-frames and cylinder block is held together by （） to form a rigid structure.

The common method of applying oil to the cylinder walls...

单项选择题The common method of applying oil to the cylinder walls is by means of small pump assembled in units, known as （）.

The cleaned heated oil, after passing through the centr...

单项选择题The cleaned heated oil, after passing through the centrifuges, is to be pumped to a （）.