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【单选题】
以铬黑T为指示剂，用EDTA标准溶液滴定水中钙离子、镁离子至溶液由酒红色变为纯蓝色时，测定的是（ ）的含量？A.
镁离子
B.
钙离子
C.
钙离子和镁离子的总量
D.
水中所有阳离子的总量
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【简答题】牛乳中的乳蛋白包括 、 及 ,在20°C下调节PH至4.6时沉淀的蛋白质属于 。
【简答题】In
this section, there is a passage with 10 blanks.You are required to
select one word for each blank from a list of choices given in the word
bank following the passage. Read the passage through c...
【单选题】It can be inferred from the passage that studies of enered species ______.
A.
have revealed little of importance to improve wildlife preservation
B.
are more likely to be carried out when a financially concerned interest group is involved
C.
sometimes ener the very species they hope to protect
D.
show that enered species can never be saved except at great cost
【单选题】It can be inferred from the passage that studies of enered species ______.
A.
have revealed little of importance to improve wildlife preservation
B.
are more likely to be carded out when a financially concerned interest group is involved
C.
sometimes ener the very species they hope to protect
D.
show that enered species can never be saved except at great cost
【单选题】Which is NOT a difference between review paper and research paper?
A.
Research papers present results of experiment while review papers summarize results and ideas from other sources.
B.
Research papers often have standard structure while review papers often do no have standard headings
C.
Research papers use graphics or images to help present original data but review papers uses graphics to explain concepts rather than presenting experimental data or graphics.
D.
Research papers can be identified from their titles and abstract but review papers cannot be revealed from their titles and abstract.
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