A.0.6m/s2; B.0.5m/s2; C.0.75m/s2; D.0.3m/s2
A.5%; B.10%; C.15%; D.12%
A.應(yīng)互相閉鎖; B.必須分開; C.應(yīng)互為備用; D.可以共用