短周期主族元素X、Y、Z、M、W在元素周期表中的相对位置如图,其中Z的核电荷数是Y 的两倍.下列说法正确的是
| A．M位于元素周期表中第三周期ⅣA族 |
| B．原子半径：Z>M>X |
| C．气态氢化物的热稳定性：Y>X>W |
| D．W的氧化物既能与NaOH反应，也能与HF反应，属于两性氧化物 |
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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