一个物体沿着南北方向在运动,若规定向南记作正,向北记作负,则该物体:
原地不动记作____米
某小组在做“探究水的沸腾”实验时,实验装置如图甲所示.
时间/min
0
1
2
3
4
5
6
7
8
…
温度/℃
9l
93
95
97
99
He has something wrong with his ________. He can't see anything.