The difference between the current liquid level and {HEAD ~ the upper limit} of {TAIL ~ liquid level} is taken as the maximum amount supplemented when only one component is supplemented 
of
The difference between the current liquid level and { HEAD ~ the upper limit } of { TAIL ~ liquid level } is taken as the maximum amount supplemented when only one component is supplemented
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH