A：电解铝所需的电能
B：人的体能
C：化学电池的电能
D：燃油汽车的动能
下列各组物理量中，全部是矢量的有（ ）
若三个有理数的积为0，则（ ）
Sunday，June 1
Dear Tony，
Now we are having fun at Tian'anmen Square. The weather is fine. There are many people here. We'll visit the Bird's Nest and the Water Cube. In the evening，we'll have Beijing Duck. I love Beijing. I hope you will come to China soon.
Your friend，
Ben
Tony White__
78 Flower Road__
New York，CBE779D，USA
在横线上填上“＞”“＜”或“=”．
1____ 88
1210 ____1
