[机] ball bearing torque test of greases

rùn huá zhī qiú zhóu chéng zhuàn jǔ shì yàn ㄖㄨㄣˋ ㄏㄨㄚˊ ㄓ ㄑㄧㄡˊ ㄓㄡˊ ㄔㄥˊ ㄓㄨㄢˋ ㄐㄩˇ ㄕˋ ㄧㄢˋ