如图所示是两个甲分子发生反应生成丙分子和乙分子的过程，则下列判断正确的是
| A．该反应为置换反应 | B．一个丙分子内有两对共用电子对 |
| C．乙分子中存在非极性键 | D．乙的摩尔质量=2倍甲的摩尔质量-丙的摩尔质量 |
相关试题
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 |
My friend showed me round the town, ______ was very kind of him. 
| A．which | B．that | C．where | D．it |
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