托辊在皮带机中的作用?
参考答案:
(1)支撑运输带与物料。
(2)防止和纠正输送带跑偏。
(3)缓和物料对输送带的冲击。
根据图片提示,照样子写五句话样子写五句话。
例: I can see a rainbow.
1. ____________________________________________
2. ____________________________________________
3. ____________________________________________
4. ____________________________________________
5. ____________________________________________
The fireman succeeded in saving all the people in the house on fire, _______they knew they were in great danger themselves.
A.because
B.since
C.unless
D.though