题目内容
往复压缩机的实际压力比大于名义压力比。
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往复压缩机单级的最佳压力比指的是绝热指示效率最高时的压力比。
往复压缩机气阀的弹簧力过强会使阀片产生颤振现象。
用 I have been doing 或I have done 填空。 You have a friend who is learning Japanese. You ask: How long ________(you /learn) Japanese?
用 I have been doing 或I have done 填空。 You have just arrived to meet a friend. She is waiting for you. You ask: __________ (you/wait) for a long time?
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