【单选题】【消耗次数：1】
转子每转一周，每个工作空间要完成两次吸油和压油，称之为双作用叶片泵。该说法（ ）
①
正确
②
错误
参考答案：
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five times as many
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five times as much
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five times than
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five times more
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I think so.
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You shouldnt surprise.
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You did an outstanding job and you really deserved it.
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No, you cant.
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Sorry，he is busy at the moment.
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On Oct 20th.
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