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【简答题】
12C和14C都是碳元素的一种，它们是同位素，但是它们的______不同。
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举报参考答案：
举一反三
【单选题】Mars fascinates scientists because of its similarity to Earth, and it fascinates the public because our myth of "Martians" is a vision of life beyond Earth. The Mars 62 continues with the launch of ...
A.
extremes
B.
extracts
C.
terminals
D.
radicals
【单选题】Mars fascinates scientists because of its similarity to Earth, and it fascinates the public because our myth of "Martians" is a vision of life beyond Earth. The Mars 62 continues with the launch of ...
A.
thus
B.
however
C.
so
D.
but
和
和
和
和
【单选题】Mars fascinates scientists because of its similarity to Earth, and it fascinates the public because our myth of "Martians" is a vision of life beyond Earth. The Mars 62 continues with the launch of ...
A.
explore
B.
explode
C.
exploit
D.
deplore
【单选题】同位素（）
A.
质子数与中子数均相同，且原子核处于相同能量状态的一类原子
B.
具有相同质子数的一类原子
C.
质子数相同但中子数不同的核素
D.
质子数与中子数均相同，但原子核处于不相同的能量状态的核素
E.
原子核处于不稳定状态，需要通过核内调整或能级调整才能趋于稳定的核素
相关题目：
【单选题】Mars fascinates scientists because of its similarity to Earth, and it fascinates the public because our myth of "Martians" is a vision of life beyond Earth. The Mars 62 continues with the launch of ...
A.
extremes
B.
extracts
C.
terminals
D.
radicals
【单选题】Mars fascinates scientists because of its similarity to Earth, and it fascinates the public because our myth of "Martians" is a vision of life beyond Earth. The Mars 62 continues with the launch of ...
A.
thus
B.
however
C.
so
D.
but
【单选题】Mars fascinates scientists because of its similarity to Earth, and it fascinates the public because our myth of "Martians" is a vision of life beyond Earth. The Mars 62 continues with the launch of ...
A.
explore
B.
explode
C.
exploit
D.
deplore
【单选题】同位素（）
A.
质子数与中子数均相同，且原子核处于相同能量状态的一类原子
B.
具有相同质子数的一类原子
C.
质子数相同但中子数不同的核素
D.
质子数与中子数均相同，但原子核处于不相同的能量状态的核素
E.
原子核处于不稳定状态，需要通过核内调整或能级调整才能趋于稳定的核素
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