ball rolling 鋼球軋制ball ring [機(jī)] 球環(huán)ball reversal [體育]進(jìn)攻策略之一ball returned to back court [體育]球回后場(chǎng)ball retainer 軸承滾珠保持架;球護(hù)圈;滾珠軸承分離環(huán);滾珠扣件ball relief valve 球形安全閥ball reamer [機(jī)械工程]球面鉸刀球面絞力ball rack [體育]球架ball race steel 滾珠軸承圈鋼ball race fit [交通運(yùn)輸工程]套圈配合ball race 滾珠座圈;[機(jī)] 軸承座圈ball pyranometer 球形總?cè)丈浔?/p>ball pulverizer [電子、通信與自動(dòng)控制技術(shù)]鋼球磨煤機(jī)[經(jīng)濟(jì)學(xué)]鋼球磨碎機(jī)ball prover [能源科學(xué)技術(shù)]球型校驗(yàn)器ball pressure tester [機(jī)械工程]球壓裝置ball possession percentage [體育]控球時(shí)間比ball possession ball porphyry [地球科學(xué)]球狀斑巖ball point setscrew 球端定位螺釘ball point pen refill 圓珠筆芯