单级齿轮式主减速器由一对（）组成。
A.螺旋锥齿轮
B.螺旋锥齿轮或双曲线齿轮
C.双曲线齿轮
D.锥齿轮
参考答案：B
I think this is the first time that we have met.＿＿＿anywhere.
A．Before have we never seen each other
B．Never before we have seen each other
C．Each other have we seen never before
D．Never before have we seen each other
按照我国《民事诉讼法》的规定，外国法院的判决需要在我国承认与执行时，有资格提出申请的（）。
A．只有当事人
B．只有外国法院
C．当事人或外国法院均可以
D．只有外国的国家机关
