【单选题】普通圆柱蜗杆传动的正确啮合条件是( )。
A.
:下标t表示端面,a表示轴向,1表示蜗杆、2表示蜗轮)
【单选题】---Who would you rather ________ the English Speech Contest? ---- Li Ping, I think , is the best choice.
【单选题】. –Tom, go to the office to fetch the papers. Who would you rather with you, Wang Lin or Li Feng? --- .
【多选题】对于壁面清洁的间壁式换热器,其传热的总热阻中可能包括以下哪些传热阻力?( )
【单选题】普通圆柱蜗杆传动的正确啮合条件是( )
C.
mt1=mx2,αt1=αx2,γ1=-β2
【多选题】谈判事项的顺序编排有以下几种方式( )。
【单选题】There is a leadership opportunity at NC State that really interests you. You would like to apply for the opportunity, but are nervous about the public speaking duties that may be necessary. What shoul...
A.
Avoid all positions and opportunities that involve public speaking.
B.
Do not apply for the position. Public speakers are born, not made.
C.
Apply for the position. Public speakers are made, not born.
D.
Apply for the position but skip any public speaking duties that become necessary.
【单选题】普通圆柱蜗杆传动的正确啮合条件是 ( ) 。
A.
mt1=mx2 ,α t1= α x2 ,γ = β
B.
mx1=mt2 ,α x1= α t2 ,γ =- β
C.
mt1=mx2 ,α t1= α x2 ,γ = - β
D.
mx1=mt2 ,α x1= α t2 ,γ = β
【单选题】---__________ take out the trash after dinner? ---Yes, sure.
【单选题】普通圆柱蜗杆传动的正确啮合条件是 ( )。