【简答题】阅读理解。 Give Your TV a break! TV-Turnoff Week is from March 20th-March 27th every year! 2,500,000 families have joined in. They are doing these things together this week. take a walk go ...
【简答题】锁紧螺钉或者打扭矩时,出于受力均匀的考虑,应先锁紧(),再将其余螺钉依次锁紧。
【单选题】2TV- Turnoff Week________
B.
b. has had more than 44 million participants since 1995
C.
c. is getting every American involved
【判断题】太阳同步轨道上的卫星,每天同一时间从地球同一位置上空经过,并保持相同运行方向,因而可重复观测地球。