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【单选题】
以碘量法测定铜合金中的铜,称取试样 0.1727 g ,处理成溶液后,用 0.1032m ol/L 硫代硫酸钠溶液 24.56 mL 滴至终点,计算铜合金中 Cu% 为( )。A.
46.80
B.
89.27
C.
63.42
D.
93.61
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反馈参考答案：
举一反三
【单选题】I received a letter， poor spelling made me think it was written by a child．
A.
which
B.
that
C.
whose
D.
who
【判断题】Test takers are penalized for writing more than the stated number of words, poor spelling and grammar.
A.
正确
B.
错误
【单选题】The typist checked the spelling carefully in order to ______ all the spelling mistakes.
A.
abandon
B.
diminish
C.
eliminate
D.
withdraw
【单选题】A résumé with poor grammar or spelling errors implies that the applicant ________.
A.
will not be a qualified employee
B.
is a reliable person
C.
is not interested in the job
D.
does not have higher degrees
【单选题】I failed to pass the English exam for my poor spelling. Oh,__________.If you agree,I’d like to help you with your spelling.
A.
nothing
B.
I am sorry to hear that
C.
I’m afraid so
D.
your spelling is so poor
【判断题】There might be good, average and poor spellers in a class. An old-fashioned spelling test is usually a good idea to tackle their spelling needs.
A.
正确
B.
错误
【简答题】我国还保留了一批古老和稀有孑遗树种，如水杉、银杉、珙桐、银杏等等，被称为“化石植物”。（ ）
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