chain barrelsteering gear舵链传动操舵装置
chain sproket gear非标准链轮齿形
chain steering gear链传动操舵装置
traction chain-gear牵引链轮
water pump chain driving gear水泵链动齿轮
drag-chain arresting gear链式拦阻装置
chain rod steering gear链传动操舵装置;舵链传动操舵装置
anchor and chain gear锚链具