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【简答题】
波长l＝600 nm的单色光垂直照射到牛顿环装置上，第二个与第五个所对应的空气膜厚度之差为____________nm．
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【简答题】施工准备工作如何分类?
【单选题】In the meantime, the question raised by our financial problems is______such research is worth the cost.
A.
whether
B.
that
C.
how
D.
because
【单选题】There were two teachers named John ________at our school, which made some of our students _____.
A.
working; confused
B.
worked; confusing
C.
work; confused
D.
to work; confusing
【单选题】Many students in our school _______ the old and they usually offer their seats to them on buses.
A.
worry about
B.
care for
C.
agree with
D.
take care
【单选题】44 A scientist is informing techs. about a new product which is starting and the type of work that the lab techs. will be expected to do. The barriers which could hinder the lab techs. ability to filt...
A.
language and semantics
B.
culture and ethics
C.
intelligence and knowledge base
D.
reputation, authority, organizational status and position
E.
relative location of the lab to the scientist's office
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