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试题答案

本文从以下几个角度介绍。

    1、河北省保定市2024-2024学年高三上学期期末地理试题
    2、保定市2024年高三第二次模拟考试地理
    3、保定2024二模地理
    4、保定2024-2024学年度第一学期高三期末调研考试答案
    5、保定高二下学期期末调研考试
    6、河北省保定市2024年高二期末考试
    7、2024保定市一模地理
    8、保定市2019-2024学年度第一学期高二期末调研考试
    9、2024保定市高三二模地理
    10、保定期末调研考试2024高二

1、保定市2024~2025学年第二学期期末调研考试高一(7月)地理试题


3、保定市2024~2025学年第二学期期末调研考试高一(7月)化学试题


John Hartwig at the University of Califormia,Berkeley,and his colleagues had previously developed a process that broke down waste plastic into its constituent parts,but it relied on the expensive metal catalysts(催化剂).Now,his team has discovered an improved process that works on both polyethylene, from which most plastic bags are made,and polypropylene,which is used to make harder objects.And it relies only on catalysts considered so common that they are essentially“dirt”,says Hartwig.
In experiments,the team used two catalysts to turm a mixture of polyethylene and polypropylene into original chemicals for plastic with the efficiency of nearly 90 percent.However,Hatwig warns that there are still many hurdles to overcome,and that the process has only been tested in the presence of a small number of common additives(添加物)."There will be additives that will affect the catalysts,"he says. This may mean having a way to separate those additives or finding catalysts that are resistant to them.
Cressida Bowyer at the University of Portsmouth,U.K.,says that even if we have a proces that can split waste plastic into constituent parts and withstand additives,other issues remain.The degree of poisonousness and disposal of the catalysts and additives must be considered,she says."These could outweigh any perceived benefits of recycling technologies.Recycling should not be seen as any kind of solution to maintaining or increasing production of single-use and unnecessary plastics and continuing the current prevailing take-make-waste culture,"she adds.
32.What does paragraph 2mainly talk about
A.The harm plastic wastes do to humans.
B.The alarming speed of making plastic wastes.
C.The low efficiency of current plastic recycling.


With a new plan in place, we started working together again. Tom became more motivated, putting his heart into his new tasks. Lily and I shared the data-recording work, and Alex took on more responsibility for plant care. We communicated constantly, sharing ideas and supporting each other. Day by day, our project took shape. When the science fair finally arrived, our hard work paid off. Our project not only looked great but also won the second prize. Through this experience, we truly learned the power of cooperation.

3、保定市2024~2025学年第二学期期末调研 高一(7月)历史答案


6、保定市2024~2025学年第二学期期末调研考试高一(7月)政治答案


5、保定市2024~2025学年第二学期期末调研考试高一(7月)生物学答案


1、保定市2024~2025学年第二学期期末调研考试高一(7月)化学答案


1、保定市2024~2025学年第二学期期末调研考试高一(7月)历史试题


3、保定市2024~2025学年第二学期期末调研考试高一(7月)语文答案


C ．若不加 Fe3+则该反应的ΔH 减小
D ．步骤②中 2molFe2+ 和 1 mol S2 O - 的总能量高于 2mol Fe3+和 2molSO- 的总能量
14 ．常温下，向10mL0. 1mol/L 二元弱酸H2A 水溶液中逐滴滴加0. 1mol/L NaOH 溶液，混合溶液中 H2A、HA-和 A2-的物质的量分数(δ )随pH 变化的关系如图所示 下 列说法不正确的是( )
A ．H2A 的 Ka1 的数量级为 10-2
B ．b 点溶液中存在：c (Na + )+c (H+ )=3c (HA-)+c (OH-)
C ．滴加10mL NaOH溶液时，c (Na + )>c (HA-)>c (H2 A ) >c (A2-)
D ．滴加15mL NaOH溶液时，2c (H+ )+c (HA-)+3c (H2A )=c (A2-)+2c (OH-)


有气泡产生


3、保定市2024~2025学年第二学期期末调研考试高一(7月)生物答案