1. An isotope of hydrogen with mass number greater than 1; deuterium or tritium.

2. A radioactive isotope of cobalt with mass number '0 and exceptionally intense gamma-ray activity, used in radiotherapy, metallurgy, and materials testing.

3. For the mass number of web pages needed to be crawled, how the information crawling system gets more web pages with good quality effectively, is related to the system performance.

4. Bosons include mesons, nuclei of even mass number, and the particles required to embody the fields of quantum field theory.

5. Chemical element is the general term for the same type of atoms with the same mass number.

6. Search the site to find in-depth information for the mass number of animals present all over the world.

7. The heavy ion beam energy, as well as the charge stripping efficiency, was calculated by using the charge state stripping formula and empirical formula of stable isotope mass number .

8. "Transferring sample under tranquil state by different intervals" we established can avoid fractionation of isotopes which have different mass number .

9. Such current disturbs the zero out-put basic line of the light mass number region, so that it's very difficult to measure and record the height of spectrum peaks of the light mass number region.