Every morning his mother _______ at six
A:wake him up
B:wakes he up
C:wakes up him
D:wakes him up
看图,完成下列题目.
元素(%)
C
H
O
N
P
Ca
S
植物
43.57
6.24
44.43
1.46
0.20
0.23
0.17
动物
55.99
7.46
14.62
9.33
3.11
4.67
0.78
板间距为d的平等板电容器所带电荷量为Q时,两极板间电势差为U1,板间场强为E1.现将电容器所带电荷量变为2Q,板间距变为 12 d,其他条件不变,这时两极板间电势差U2,板间场强为E2,下列说法正确的是( )