| Regarding the operating principle of a reverse-osmosis type freshwater generator, what statement is true? |
| A) External pressure is applied to the side of strong concentration forcing salt through the semi- permeable membrane to the side of weak concentration. |
| B) External pressure is applied to the side of weak concentration forcing salt through the semi- permeable membrane to the side of strong concentration. |
| C) External pressure is applied to the side of weak concentration forcing freshwater through the semi-permeable membrane to the side of strong concentration. |
| D) External pressure is applied to the side of strong concentration forcing freshwater through the semi-permeable membrane to the side of weak concentration. |
