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【多选题】
薄膜干涉分为等厚干涉和等倾干涉,下面说法正确的是:A.
在厚度相等的薄膜上发生的干涉为等厚干涉。
B.
当入射角固定,在波长一定的情况下,光程差只取决于薄膜的厚度。相同厚度的地方形成同一级,这样的干涉是等厚干涉。
C.
入射光的倾角相等时发生的薄膜干涉为等倾干涉。
D.
薄膜的厚度均匀,在波长一定的情况下,光程差只取决于入射倾角的大小。 相同倾角的光线形成同一级,这样的干涉是等倾干涉。
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举一反三
【单选题】It was a long time ______ the neighbors found that the old lady had been dead of cold.
A.
when
B.
until
C.
since
D.
before
【单选题】The old lady had a ______ escape when she pass across the road in front of the bus.
A.
close
B.
short
C.
narrow
D.
fine
【单选题】The old lady had two clever sons, ____ did a good job in the 2010 National College Entrance Exam, though.
A.
none of them
B.
both of whom
C.
none of whom
D.
neither of whom
【简答题】While she was going downstairs, the old lady had her leg (break)______.
【单选题】The old lady had expected to see all her relatives when she was ill in hospital, but none came to see her ______ many of her neighbors offered their help．
A.
when
B.
as
C.
because
D.
while
【简答题】Seeing that the old lady had no chair ___, the boy offered her his own. A, to sit B to be seated C. to seat herself D. to sit on
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