问题
单项选择题
柴油机的（）由水泵、散热器、机油冷却器、节温装置、缸体和缸盖等组成。
A.冷却系统
B.循环系统
C.散热系统
D.润滑系统
答案
参考答案：A
搜题请搜索小程序“爱下问搜题”
柴油机的（）由水泵、散热器、机油冷却器、节温装置、缸体和缸盖等组成。
A.冷却系统
B.循环系统
C.散热系统
D.润滑系统
参考答案：A
On the way to school, a little boy found a cocoon(茧) of a butterfly and watched it everyday. One day, it started to break through a small hole in the cocoon, but it 26 greatly. Finally, it seemed it couldn’t succeed. The boy felt 27 for the butterfly because he knew it was going to die if it didn’t get out. So he ran into the house and got a pair of 28 and cut the cocoon a little. The butterfly came out and was free. The only strange thing was that the butterfly has a swollen(肿胀的) body and dry 29 . The boy kept waiting for the swelling to go down and for the wings to grow, but 30 didn’t. The butterfly crawled（爬）around and unable to 31 and then it died an early death. Therefore, he learnt that the butterfly was supposed to struggle to get out of the cocoon. In fact, the struggle to get out of the cocoon 32 the fluid(液) out of the body and it its wings. 33 the struggle, the butterfly couldn’t grow, and would 34 fly. By trying to help the butterfly, the boy 35 hurt it.
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