陆游名句“王师北定中原日,家祭无忘告乃翁”中的“王师”,其调兵之权应属于: [ ]
A.节度使
B.枢密院
C.三司使
D.转运使
答案:B
根据句意,用所给单词的适当形式填空。
1. Look, there is a bird _____ (sing) in the tree.
2. The bad air makes my chest hurt and it's difficult for me _____ (breath).
3. They are doing their homework carefully. You'd better not _____ (disturb) them.
4. Litter _____ (influence) the look of our city.
5. It is known that smoking does great _____ (harm) to us.
现在V、W、X、Y、Z五种元素,它们的核电荷数依次增大,且都小于20,其中V的一种原子的原子核内没有中子;W和Y元素原子的最外层电子数相同,且W元素原子L层电子数是K层电子数的3倍,Y元素原子最外层电子数是X元素原子最外层电子数的两倍;X、Z是金属元素,Z的核外电子排布与Ar原子相同。请回答:
(1)V是_________,X是_________,Z是_________(填元素符号)
(2)Y在周期表中的位置是__________________;
(3)V和W形成V2W型化合物的电子式为_________,所含的化学键类型为_________;
(4)用电子式表示Z和Y形成化合物的过程是___________________________。