十字丝中心与物镜光心的连线称为（）。 A.横轴 B.竖轴 C.旋转_爱下问搜题

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问题单项选择题

十字丝中心与物镜光心的连线称为（）。

A.横轴

B.竖轴

C.旋转轴

D.视准轴

答案

参考答案：D

选择题

27. More and more Chinese women are having difficulty ______ Mr. Right or are choosing the single life.

A．to find

B．finding

C．found

D．in being found

选择题

As time _______, we know each other.[ ]

A. goes by

B. passing by

C. went off

D. going by