题目内容
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提问人:网友leeshy
发布时间:2022-01-07
[主观题]
I thought it was still early, yet I got to the library _____ find it closed.
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For a pair of standard involute helical gears,,,,,,. Find: (1) reference circle, addendum circlededemdum circleand center distance. (2) normal pitchand transverse pitch. (3) transverse meshing angleand contact ratio.
It was not until midnight ______ the parents finally found their lost kids. |
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A. that B. when C. while D. as |
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