1，On the day of first frost,the Sun's rays reach an angle of_______ degrees to the earth.
A: 210
B: 220
C: 200
D: 230
A: 210
B: 220
C: 200
D: 230
举一反三
- 触媒使用初期温度在（）。 A: 210~220℃ B: 200~220℃ C: 210~230℃ D: 220~230℃
- Why does the earth become cool? A: Because the sun gives the heat to the earth. B: Because the moon gives the wind to the earth. C: Because the earth rotates . D: Because the sun's heat bounces to the space.
- When the sun's rays hit the earth, a lot of heat is __________ back into space. A: considered B: impressed C: eflected D: affected
- 运动强度最大心率( ) A: 220−年龄 B: 200—年龄 C: 210—年龄 D: 230—年龄
- 马钱子炮制的最佳条件 A: 温度200℃—210℃时间3—4min B: 温度210℃—220℃时间2—3min C: C温度220℃—230℃时间2—3min D: D温度230℃—240℃时间3—4min