题目：
| 一台四冲程内燃机飞轮转速为1200r/min，它1s完成了（ ） A．30个冲程 B．60个冲程 C．40个冲程 D．80个冲程 |
答案：
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参考答案：D
一台四冲程内燃机飞轮转速为1200r/min，它1s完成了（ ） A．30个冲程
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