A.30±5,30±5 B.180±5,180±5 C.30±5,180±5 D.30±5,210±5
A.(50±10)N/sB.(50±5)N/sC.(2400±200)N/sD.(2400±10)N/s
A.(50±10)N/s B.(50±5)N/s C.(2400±200)N/s D.(2400±10)N/s