A:Na
B:NaCl
C:NaOH
D:Na2O
下列属于非金属元素的是( )
补全表格申所缺信息。
People
Things they did
Time
Places
Jane
Helped kids____
Every Friday
In the club
Sam
Helped to give food to the poor
On Thanksgiving Day
In a local____
Paul
Helped to____
On Clean-up Day
In a local park
Alice
____
At a local animal house
已知:M的结构简式为: 。
请回答下列问题:
俗话说:“当局者迷,旁观者清。”这告诉我们( )