Remember, all you have to do is fill in the one or two-letter abbreviation for the chemical symbol.

记住，你们只要，用一两个字母的缩写，来代表化学元素就可以了。

youdao

Remember, all you have to do is fill in the one or two-letter abbreviation for the chemical symbol.

记住，你们只要,用一两个字母的缩写,来代表化学元素就可以了。

youdao

The cross-section symbol of the pattern fill is a necessary material marker for the cross-sectional view of the solid object.

填充图剖面符号是机械制图、建筑制图中实体剖视图必不可少的材料标识。

youdao

The cross-section symbol of the pattern fill is a necessary material marker for the cross-sectional view of the solid object.

填充图剖面符号是机械制图、建筑制图中实体剖视图必不可少的材料标识。

youdao