单项选择题
A.1-2 B.2-4 C.3-4 D.4-6
A.全悬挂 B.半悬挂 C.左悬挂 D.右悬挂
A.Φ450 B.Φ480 C.Φ500 D.Φ550
A.-Tc–Mp–Mp–Tc- B.+Tc–Mp+Mp–Tc+ C.+Tc+Mp–Mp–Tc+ D.+Tc–Mp–Mp–Tc+
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