. Trade tests; the scientific measurement of trade proficiency . 7. Q. What is in the tank at ** B ? A. (i) Oxygen.(2) Air. 8. Q. What is at D ? A. (i) Pressure gauge. (2) Pressure meter. (3) Pressure indicator. (One sufficient) (One sufficient) (Note: Pressure regulator is wrong.) 214 TRADE TESTS PICTURE 3 9. Q. How many volts wouldyou get from that arrange-ment if each cell gives twovolts?A. PICTURE 4 10. Q. How many volts would youget from that arrangementif each cell gives two volts?A. Eight.

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