问题
问答题 简答题
四冲程柴油机的压缩冲程特点是什么？
答案
参考答案：
四冲程柴油机的压缩冲程特点是：进排气门关闭，气缸处于密封状态，压力和温度升高，压缩冲程结束之前（约曲轴转角上死点前15º～19º），喷油器喷油，活塞到达上死点时压缩冲程结束。
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四冲程柴油机的压缩冲程特点是什么？
参考答案：
四冲程柴油机的压缩冲程特点是：进排气门关闭，气缸处于密封状态，压力和温度升高，压缩冲程结束之前（约曲轴转角上死点前15º～19º），喷油器喷油，活塞到达上死点时压缩冲程结束。
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| The temperature (温度) of today is 40℃. It's a sunny and __1__ day. My cousin and I go to the __2__. We think it's an interesting place in __3__. There are a lot of people on the beach. They are having a good time. Look at that group __4__ people. They are playing __5__ beach volleyball. Some boys are lying on the beach __6__ talking. They are very __7__. Look at that man. He is __8__ photos. His camera is beautiful. There are also many people swimming in the sea (海). __9__ look very happy. We want to __10__, too. | ||||
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