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【简答题】
为防止水体污染，某工厂在废水排放前对废水中的某些金属进行回收，该工厂的废水中含有AgNO 3 Cu（NO 3 ） 2 Fe（NO 3 ） 2 三种溶质，向废水中加入锌粉，充分反应后过滤；向得到的滤液中加入稀盐酸，没有现象，则滤渣中一定有______，滤液中一定有______．写出上述过程中一定发生反应的化学方程式______
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【单选题】钢筋电渣压力焊接头成型不美观的原因主要是( )或钢筋端面不够平整或引弧铁丝 圈安放不正。
A.
焊接电流大，实际钢筋熔化量少
B.
焊接电流小，实际钢筋熔化量少
C.
焊接电流大，实际钢筋熔化量大
D.
焊接电流小，实际钢筋熔化量大
【简答题】无菌包内物品一次末用完,则按原折痕包好,有效期为( )小时;铺好的无菌盘有效期为( )小时;已开启的瓶内溶液,可保存时间是( )小时。
【简答题】What are the three most common metal crystal structures? List three metals that have each of these crystal structures.
【多选题】The idea of self-government is in the first three words of the Constitution. What are these three words?
A.
America
B.
The
C.
People
D.
We
【简答题】气相色谱仪的心脏是
【单选题】What are these three fields in “Devouring Music: Ruminations of a Composer Who Cooks” by Professor Hamlin?
A.
music, cooking and interdisciplinary writing
B.
music, cooking and creative writing
C.
composition, cooking and creative writing
D.
composition, cooking and interdisciplinary writing
【简答题】Every variable has at least three items associated with it. What are these items?
【简答题】How many parts are included in these three posters and what are they?
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