英文缩写

x.

X. crystal cut 晶体切割

X. parallactic angle 星位角

X. Submarine Craft (self-propelled) 自动推进潜水小艇

X. mol(e) fraction 摩尔分数

X. electronegative atom or group 负电性原子；负电性基团

X. potential gradient in electronic field 电场内电势梯度

x. beer strength 啤酒浓度