题目内容
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[主观题]
假定照相机镜头是薄透镜，焦距为100mm，通光孔径为8mm，在镜头前5mm处装有一个直径为7mm的光阑，求照
相镜头的F数；如果将光阑装在镜头后5mm处，镜头的F数多大？
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A．on
B．in
C．at
D．within
更多“假定照相机镜头是薄透镜，焦距为100mm，通光孔径为8mm，…”相关的问题
第1题
As this item falls within the business scope of our cort/oration, we shall be pleased to enter into business relations with you ______ an early date.
第2题
As this article falls（)the scope of our business activities, we take this opportunit
As this article falls()the scope of our business activities, we take this opportunity to express our wish to conduct some transactions with you in the near future.
A. with
B. in
C. within
D. at
第3题
As the goods ____ within the scope of our business activities, please contact us immed
iately.
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A. falls
B. fall
C. fell
D. falling
第4题
Because the article falls ________ the scope of our business activities, we are writin
g to you in the hope of ________ trade relations with you.
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A、within; establishment
B、within; establishing
C、below; set up
D、below; setting up
第6题
Dear Sir or Madam Through the courtesy of the Commercial Counselor of your Embassy in London , we come to
Dear Sir or Madam
Through the courtesy of the Commercial Counselor of your Embassy in London , we come to know your name and address. Also we are informed that you are a prospective buyer of Chinese Cotton Piece Goods. As this item falls within the scope of our business activities , we shall be pleased to enter into business relations with you.
We enclose a brochure and a pricelist to acquaint you with our commodities now available for export. Quotations and samples will be airmailed to you upon receipt of your specific inquiry.
Your favorable reply will be highly appreciated.
Yours faithfully
第7题
We have learned that you are importing canned food, which falls our business line.
A．to
B．within
C．for
D．onto
第8题
In this system, the discussion of the noumenon of the cosmos falls within the scope of the quest for truth. （time:6:09)
A、phenomenon
B、thing-in-itself
C、entity
D、a thing or event that is known about, even though it cannot be detected by any of the five human senses
第9题
Your communication of October27 addressed to our Head Office has been passed on to us
for atterntion and reply,as the products you require fall within the scope of our business activities.
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