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單項選擇題

液壓系統(tǒng)的真空度等于（）。

A.絕對壓力與大氣壓力之差
B.大氣壓力與絕對壓力之差
C.相對壓力與大氣壓力之差
D.大氣壓力與相對壓力之差

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單項選擇題

對于載荷小，速度高的軸承應(yīng)選用（）的潤滑油。

A.粘度較小
B.粘度較大
C.油性較好
D.潤滑脂

單項選擇題

對于載荷大，沖擊大的軸承可選用（）的潤滑油。

A.粘度較小
B.粘度較大
C.油性較好
D.潤滑脂

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