The line coming from the Discharge Line, which comes from the Compressor into the 4-Way Valve
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The suction line is the big one. This line should be cold when the unit is on. The small line is the liquid line.
True
The intersection of three planes can be a plane (if they are coplanar), a line, or a point.
With the limited information provided by the question, the only statement which must be true is FJ = JH.
The ideal line is a concept. A line that is drawn cannot be a mathematically true line since it will have a thickness - no matter how small. Also, it cannot be infinitely long - no matter how large.