单项选择题
“Respected Chairperson, friends, first of all let me express my sincere gratitude to the Association of Commonwealth Universities for inviting me to this conference.” is an example of ___________.
A.introducing yourself
B.stating your topic
C.summarizing the main points
D.showing gratitude to the audience
“Respected Chairperson, friends, first of all let me express my sincere gratitude to the Association of Commonwealth Universities for inviting me to this conference.” is an example of ___________.
A.introducing yourself
B.stating your topic
C.summarizing the main points
D.showing gratitude to the audience
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单项选择题
如果在4f系统中的物平面放置一个衍射屏,当衍射屏在物平面内微小移动时,在频谱面得到的图像将会__________,在像平面上得到的图像将会__________。
如果在4f系统中的物平面放置一个衍射屏,当衍射屏在物平面内微小移动时,在频谱面得到的图像将会__________,在像平面上得到的图像将会__________。
A.移动,不移动
B.不移动,移动
C.移动,移动
D.不移动,不移动