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【单选题】
对闭式蜗杆传动进行热平衡计算,其主要目的是为了() 。
A.
防止润滑油受热膨胀后外溢，造成环境污染
B.
防止润滑油温度升高而使润滑条件恶化
C.
防止蜗轮材料在高温下力学性能下降
D.
防止蜗杆蜗轮发生热变形后正确啮合受到破
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【简答题】One day Jack’s wife was cleaning out a closet. “Look at all these umbrellas,” she said to Jack. “There are eight and they are all broken.” “I’ll take them to the umbrella shop and have them mended,” J...
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