I have some hydraulic questions that I need help with: (1) The type of fluid recommended for most hydraulic systems is a: (A) Petroleum oil, B: Synthetic, C: Water-glycol, D: Water-oil emulsion.  (2) Liquids transmit pressure in one direction only, True or False. (3) When in neutral, center valves have: A: Ports A&B blocked, B: Ports P&T Blocked C: Ports P&A Blocked, D: All ports blocked (4) Graphical diagrams are made up of --- A: Geometric symbols, B: Cutaway views C: Cracking override, D: Pictoral views. (5) A solid line in a graphical diagram represents a ---- line A: Pilot, B: Center, C: Pressure, D: Drain. (6) When color coding hydraulic lines --- should be used to represent a pressure line A: Blue, B: Yellow, C: Orange, D: Red. (7) In color coded diagrams intake and drain lines are colored A: Red, B: Orange, C: Blue, D: Green