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【单选题】
在进行亚慢性毒性作用实验时，实验周期一般为：A.
24 小时
B.
90天
C.
半年以上至终生
D.
一
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举一反三
【简答题】热电偶测温必须具备的条件是 和 。
【单选题】听力原文： Cambridge is about 86 kilometres northeast of London. It is one of the most beautiful places in Britain. Everything about the city of Cambridge reminds you of its famous university: student on b...
A.
Watching traditional plays.
B.
Visiting the magnificent libraries.
C.
Boating on the river.
D.
Cycling in narrow streets.
【单选题】听力原文： 'Where is the university?' is a question many visitors to Cambridge ask, but no one can give them a clear answer for there is no wall to be found around the university. The university is the cit...
A.
To see Cambridge University.
B.
To study in the colleges in Cambridge.
C.
To use the libraries of the university.
D.
To visit the professors there.
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