上四通坐落在下四通上并通过密封法兰与下四通相连，其侧面设有出油口；
刚性层深度及层间接触状态对FWD动载响应及反算结果的影响
1·For example subjacent device can store the drawer that the thing USES, the woodiness mesa after two-phase superposition also can regard as the table is used.
例如在下方装置了可储存东西用的抽屉，两相叠合后的木质台面也可以当作桌子使用。