问题
单项选择题
压力机上常用的各类润滑剂应具有的性质不包括（）。
A、能形成有一定强度而不破裂的油膜层，用以担负相当压力
B、不会损失润滑表面
C、能很均匀地附着在润滑表面
D、不能很轻易的清洗干净
答案
参考答案：D
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压力机上常用的各类润滑剂应具有的性质不包括（）。
A、能形成有一定强度而不破裂的油膜层，用以担负相当压力
B、不会损失润滑表面
C、能很均匀地附着在润滑表面
D、不能很轻易的清洗干净
参考答案：D
| 完形填空。 | ||||
| I'll never forget that summer day in 1965 when my mother suddenly died. Later that after-noon, a police officer came to ask my father' s permission (允许) for the hospital to 1 mother's valve (心脏瓣膜). I shouted and cried. At fourteen I 2 couldn't understand why anyone would take it away from a person I 3 But my father told him. "Yes." "Linda," he said quietly putting his arms 4 me, "the greatest thing you can give is a part of yourself. Your mother and I decided 5 that if we can make a difference in just one person' s 6 after we die, our death will have meaning." The 7 my father taught me that day became one of the most 8 in my life. Years passed. In 1996, my father was seriously ill and he told me when he died, he wanted to donated (捐献) whatever needed, especially his eyes. My father died and we donated his eyes 9 he had wanted. Three days later,my daughter said, "Mum, I'm so 10 what you did for grandpa." At that moment I realized that my father gave much more than his 11 . What he 12 behind sparkled (闪耀) in my daughter's eyes. That was love. | ||||
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