A、[20-1/4t0.05(16),20+1/4t0.05(16)]
B、[20-1/4t0.1(16),20+1/4t0.1(16)]
C、[20-1/4t0.05(15),20+1/4t0.05(15)]
D、[20-1/4t0.1(15),20+1/4t0.1(15)]
A、[20-1/4t0.05(16),20+1/4t0.05(16)]
B、[20-1/4t0.1(16),20+1/4t0.1(16)]
C、[20-1/4t0.05(15),20+1/4t0.05(15)]
D、[20-1/4t0.1(15),20+1/4t0.1(15)]
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