A:恒为正数
B:恒为负数
C:等于0
D:正、负都有可能
It's six o'clock in the afternoon. It's time for 1!Jenny and Li Ming are2. Jenny's mother is 3 in the kitchen. Jenny and Li Ming help Mrs. Smith 4 the vegetables. After dinner, Mrs. Smith washes the 5 dishes. Li Ming dries the dishes.
下列地图图幅大小相同,比例尺最大的应是( )
0.70=____ 105.0900=____
我国一艘科学考察船,从南极乔治王岛(长城站)按地球自转方向绕南极洲海域航行一周,它们所经过的大洋顺序依次为 ( )