根据“C（金刚石）=C（石墨），△H= －1.896kJ·mol－1”，可以得出的正确结论是
| A．石墨的能量比金刚石低 | B．石墨和金刚石都是碳的同位素 |
| C．金刚石转变为石墨是物理变化 | D．金刚石比石墨更稳定 |
相关试题
It is often ______ that human beings are naturally equipped to speak.
| A．said | B．to say | C．saying | D．being said |
I can’t leave. She told me that I ______ stay here until she comes back.
| A．can | B．must | C．will | D．may |
—— Do you mind my opening the window? It’s a bit hot in here.
—— ______ , as a matter of fact
| A．Go ahead | B．Yes, my pleasure |
C．Yes, I do | D．Come on |
It’s high time you had your hair cut ; it’s getting _______ . 
| A．too much long | B．much too long |
C．long too much | D．too long much |
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