短语词组短语parallel sinkage 平行下沉valve sinkage 气门下陷sinkage experiment [水运]沉浮试验sinkage range 钻井压缩机升沉sinkage stiffness 下沉刚度sinkage measurement 沉陷量测定sinkage e 下沉settlement sinkage 沉降 返回 sinkage