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【简答题】
用重铬酸钾法测定水样的 COD 时,实验中所用催化剂为 ,如水样中氯离子含量高加入 掩蔽剂。
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反馈参考答案：
举一反三
【单选题】Those who are truly confident ________.
A.
succeed without effort and hard work
B.
encourage people to become confident
C.
appear more attractive and thus become successful
D.
gain the confidence of others and feel successful
【单选题】Those who are truly confident ______
A.
succeed without effort and hard work
B.
encourage people to become confident
C.
appear more attractive and thus become successful
D.
gain the confident of others and feel successful
【单选题】The author's attitude toward the future of solar energy is ______.
A.
optimistic
B.
pessimistic
C.
uncertain
D.
disappointed
【单选题】What is the author's attitude towards the environmental effects of pesticides?
A.
Pessimistic.
B.
Indifferent.
C.
Defensive.
D.
Concerned.
【单选题】Those who are truly confident ________.
A.
succeed without effort and hard work
B.
encourage people to become confident
C.
appear more attractive and thus become successful
D.
gain the confidence of others and feel successfu
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