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【简答题】
光纤的核心是由折射率较大的 和折射率较小的包层构成的双层同心圆柱结构。
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反馈参考答案：
举一反三
【单选题】患者,男性,45岁,肛瘘切除术后第3天,护士嘱咐其每日须行温水坐浴和换药。病人换药、坐浴、排便的正确顺序是
A.
先换药，再大便，后坐浴
B.
先坐浴，再大便，后换药
C.
先大便，再换药，后坐浴
D.
先坐浴，再换药，后大便
E.
先大便，再坐浴，后换药
【简答题】Who invented the co ne to facilitate eating in the street?
【简答题】含氮废物大都由尿素构成的动物是_____类和_____类。
【单选题】What is the advantage for the people who join the co-op for a 6-month period?
A.
The membership fee is lower.
B.
They can help choose the products that will be sold.
C.
They may attend fewer meetings.
D.
They may go to the co-op more times per week.
【简答题】含氮废物大都由尿素构成的动物是()类()类。
【单选题】The title, 'The Secret of America' refers to ______.
A.
the fifty-five men who framed the Constitution
B.
the wisdom that speaks to us in our Constitution that made American what it is
C.
the year 1787
D.
Madison, Mason, Sherman, Wilson, Morris, and Hamilton-men who had considerable influence in the drafting of the Constitution
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