Tear ducts (泪腺) operate on a n...tears. (lubrication)
举一反三
- 中国大学MOOC: Tear ducts (泪腺) operate on a normal basis to and protect the eye. When you have an emotion, they overact and create tears. (lubrication)
- It is often cheaper ____downbuildings than to repair them. A: tears B: to tear C: tore D: torn
- 将泪腺分为眶部和睑部泪腺的，其肌腱从泪腺中通过的是 A: 外直肌\n B: 上斜肌\n C: 上直肌\n D: 提上睑肌
- The cylinder lubrication system of a large two-stroke diesel engine is usually a kind of _____. A: dry sump lubrication system B: wet sump lubrication system C: splash lubrication D: total loss lubrication system
- In modern engine designs, two methods of lubrication are combined: pressure lubrication and splash lubrication (see Fig.3-7).