7米= ____ 厘米                 135厘米= ____ 米 ____ 厘米

1米= ____ 厘米                 24厘米+10厘米= ____ 厘米

400厘米= ____ 米               2米+50厘米= ____ 米 ____ 厘米

下图中表示“不准动”游戏中的两个情景，坐在石块上的小孩先双手蒙住眼睛，后来放开手。在这个过程中，____(填序号)小孩做了机械运动，你是以____为参照的.

如图，已知A₁（1，0），A₂（1，1），A₃（﹣1，1），A₄（﹣1，﹣1），A₅（2，﹣1），…则点A₂₀₁₇的坐标为____．

若复数$z=\left(5\sin \theta -3\right)+\left(5\cos \theta -4\right)i$是纯虚数，则$\tan \theta$的值为（   ）

    Spring in Nanjing is very short .It is warm and sunny .People (人们) like to go to the parks on sunny days . It is very hot in summer in Nanjing .People do not like to play balls in the afternoon .They like to go swimming in summer . In autumn , it is cool and sunny. Many people like to come to Nanjing in autumn .In winter , it is cold in Nanjing .Boys and girls like to make snowmen and go skating . They have great fun in winter .