①年龄组成 ②性别比例 ③出生率和死亡率 ④迁入和迁出的个体数量
荷兰的特色产业是
求商
35÷7=____14÷2=____ 21÷3=____ 28÷4=____
用手握住瓶子,使瓶子在竖直方向静止,如果握力加倍,则手对瓶子的摩擦力( )
1).When did they do the survey? (last Thursday/last Friday)
2).What is the survey about? (breakfast/supper)
你可以这样开始:The students did a survey about…
Answer:____