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In the global futures market, precious metal futures trading varieties are ().
Answer: a, c

The precious metals are gold (Au), silver (Ag) and platinum group metal nails (Ru), rhodium (Rh), palladium (PD), osmium (Os), iridium (Ir) and platinum (Pt). In the global futures market, there are four kinds of precious metal futures trading: gold, silver, platinum and palladium, among which the trading volume of gold and silver is relatively large.