1、单选题：
What is the relationship between 123I and 124I?( )
选项：
A:Element
B:Nuclide
C:Isotope
D:Isomer
答案: 【Isotope】

2、判断题：
A nuclide has the same N , Z and energy state .（ ）
选项：
A:错
B:对
答案: 【对】

3、判断题：
WhenTc m decay into Tc, the mass is changed. （ ）
选项：
A:对
B:错
答案: 【错】

4、判断题：
Atomic nuclei are spontaneously affected by external influences ，such as temperature, pressure, electromagnetic fields.( )
选项：
A:错
B:对
答案: 【错】

5、单选题：
Which is true for Gamma decay?( )
选项：
A:99mTc decays into 99Tc is a type of gamma decay.
B:The mass number is not changed.
C:It is a type of electromagnetic radiation.
D:The atomic number is changed.
答案: 【The atomic number is changed.】