建立了砂轮的球基渐开螺旋面方程和分度球面螺旋线方程,给出螺旋运动参数、螺旋线导程.The mechanism of grinding internal gear of spherical worm emery - wheel is researched.正圆锥螺旋面是正圆柱螺旋面被同轴正圆锥面截得.The ortho cone helicoid was used interrsect intercept by the ortho con...
The silkworms have gone into the bushes to spin their cocoons.蚕上山了.Silkworms make cocoons.蚕做茧。Many species of earthworms produce cocoons through the year.许多种蚯蚓全年产茧....
内阁可能背弃这些承诺。The cabinet may backpedal on these commitments.他所有的朋友在他丢钱以后背弃了他.All his friends went back on him after he lost his money.因为他嫌恶军队生活, 所以他决心背弃自己所在的那个团.As he hated army life, he decide to desert his regiment....
I'd like to inquire about a book. Do you have The Voyage of the Beagle by Darwin?我要查问一本书, 你们有达尔文著的《探险号航海记》 吗 ?Sinus arrhythmia appeared in 15 % of beagle dogs.beagle犬存在着窦性心律不齐,比例为15%.Objective To identify expression...