如图所示是汽油机工作过程中的______冲程．一单缸四冲程汽油机的飞轮转速是1800r/min，则该汽油机每秒内完成______个冲程，对外做功______次．
当气门关闭、活塞向下运动、电火花打火时，该冲程是汽油机的做功冲程；
由题意可知，单缸四冲程汽油机的飞轮转速是1800r/min，即每秒钟转30圈，完成60个冲程，做功15次；
故答案为：做功，60，15．
Choose the best response from A to F according to the sentences given. Each choice should be used only once. Tina: What are your favorite sports? Ben: 小题1: Tina: Now, tell me what you like to eat. Ben: Err, I like fish and eggs. But 小题2: Tina: 小题3: Ben: Oh, yes. I love vegetables. Tina: Do you like wine? Ben: No, I never drink wine or coffee. 小题4: Tina: 小题5: Ben: I drink a lot of milk. It’s very good for my health.
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