We all feel it is Jack as well as his wife that ________for their son's bad performance at school.
A:are to blame
B:is to be blamed
C:are to be blamed
D:is to blame
二次函数y=ax2+bx+c的部分对应值如下表:
x
…
﹣3
﹣2
0
1
3
5
y
7
﹣8
﹣9
﹣5
①抛物线的顶点坐标为(1,﹣9);
②与y轴的交点坐标为(0,﹣8);
③与x轴的交点坐标为(﹣2,0)和(2,0);
④当x=﹣1时,对应的函数值y为﹣5.以上结论正确的是 ____
实验序号
水的质量(g)
加入NaCl的质量(g)
溶液的质量(g)
①
10
2
12
②
13
③
4
13.6
④
下列关于法国的叙述,不正确的是( )