链条装上以后,在与水平线夹角>45℃时,其从动边的弛垂度应约等于两链轮中心距的()。
A.0.5~0.8%
B.0.8~1%
C.1~1.5%
D.1.5~2%
参考答案:C
读图,完成下列问题.
(1)写出图中A、B、C三地的地理坐标.
A.______,B.______,C.______.
(2)在图中A、B、C三地中,位于南、北半球分界线上的是______地,位于东半球的是______地,位于西半球的是______地.
(3)下列地点中,位于北半球、中纬度、西半球的是______.
A.(40°S,30°W)B.(40°N,15°W)C.(45°N,30°W)D.(40°S,170°W)
小题1:That’s an (interest) computer game.
小题2:Can you (bring) your photos to school.
小题3:She is from France,so she can speak (France ) very well.
小题4:The animals in the zoo are from different (country).
小题5:She practices (play) the piano every day.
小题6:Listen!The girl (sing) in the room.
小题7:The Greens (take)lots of photos on the beach yesterday.
小题8:Mike is funny.He always make us (laugh).
小题9:Peaple can’t live (with) water.
小题10: (luck),he missed the train.