____ ÷ 10=____=16 ÷ ____
—No, they are not mine. They belong to _________.
用化学用于填空:
(1)氢原子____
(2)2个二氧化硫分子 ____
(3)3个铵根离子 ____
(4)氧化铁中铁元素的化合价 ____ .