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【单选题】
在分光光度分析中,常出现工作曲线不过原点的情况,下列说法中不会引起这一现象的是
A.
测量和参比溶液所使用吸收池不对称
B.
参比溶液选择不当
C.
显色反应的灵敏度太低
D.
测量和参比溶液所用吸收池的材料不同
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【多选题】I am writing a letter to him.以上句子的调冠是?
A.
I
B.
am
C.
writing
D.
a
【单选题】I am writing a letter _______ my grandmother. [     ]
A.
to
B.
of
C.
in
【单选题】I am writing to express my heartfelt gratitude. I am referring to that unfortunate accident the other day, when I was knocked ()my bike by a motorcycle.
A.
down
B.
off
C.
by
D.
with
【判断题】社会科学领域不会应用统计学。
A.
正确
B.
错误
【单选题】—Are you reading a book? — I am writing a letter. [     ]
A.
Yes, I am.
B.
No, I'm not.
C.
Yes, it is.
D.
No, it isn't.
【单选题】I am _____________. [     ]
A.
write
B.
writeing
C.
writing
【简答题】Dear Sir or Madam, I am writing in response to the advertisement in the Guardian newspaper on the 1st July.I would like to apply for the post of Technology Sales Representative in your company. I am 2...
【简答题】阅读理解。 I am a writing teacher at a middle school. At the end of a writing class, I asked the students to share what they had written. We had a new student at the school, Al. Al had been with us for onl...
【判断题】社会科学领域不会应用统计学。()
A.
正确
B.
错误
【简答题】I am writing this letter to complain about the service in your hotel.
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