Who discovered the X ray ( ).
举一反三
- 中国大学MOOC: Who discovered X-rays?
- The continuum spectrum of X ray comes from ( )
- It was Dr. Rontgen who （） X-rays. A: discovered B: invented C: made u
- Who discovered X-rays?? Par. 1|Par. 4|Par. 3|Par. 2
- 中国大学MOOC: Whether discovered or not, dishonesty has an undesirable effect on anyone who ________ it. (practice)