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