The concentration of dissolved solids in water can be measured with several different units， including（）.

The concentration of dissolved solids in water can be measured with several different units， including（）.
A.parts per million
B.weight percent
C.grams of salt per liter
D.grams Nacl per liter
正确答案：parts per million；weight percent；grams of salt per liter；grams Nacl per liter