光合作用的作用光谱
action spectrum of photosy nthesis
半流体润滑剂的性能评价
performance evaluation for semi-fluid lubricant
可伸长斗杆的润滑剂
extendable stick lubricant
耐特高压的润滑剂
active extreme pressure lubricant
润滑剂的极性
the polarity of lubricant
润滑剂的摩擦特性
frictional characteristics of lubricant