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【单选题】
能将羰基还原为亚甲基的试剂A.
浓HCl+ZnCl 2
B.
浓HCl+Zn(Hg)
C.
AgNO 3 + EtOH
D.
[ Ag(NH 3 ) 2 ]OH
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举一反三
【单选题】Fix the fuel injector into _____ after repair.
A.
the cylinder liner
B.
the cylinder cover
C.
the cylinder jacket
D.
the piston
【简答题】克服演讲中怯场的技巧有：() A充分准备 B充分自信 C选择熟悉的题目 D熟悉讲稿 E深呼吸
【简答题】克服演讲中怯场的技巧有： A充分准备 B充分自信 C选择熟悉的题目 D熟悉讲稿 E深呼吸等
【单选题】(2013·黑龙江四校高三联考)The church ________ from the 18th century is under repair at present.
A.
dates
B.
to date
C.
dated
D.
dating
【简答题】按计划所覆盖的宽度分类 、
【单选题】To ensure the quality of dock repair, C/E should know very well ____.
A.
the repair standard of main docking repair item
B.
the special tool for repair item
C.
the skill of repairer
D.
the status of docking repair equipment
【单选题】What is true of voyage repair
A.
Voyage repair is a major repair work
B.
Voyage repair is of temporary repair
C.
Voyage repair is carried out in a dock
D.
Voyage repair can lead to voyage schedule breakdown
【简答题】异性带电离子为何在溶液中能同时稳定存在
【简答题】若不同两点 P,Q的坐标分别为(a,b),(3-b,3-a),则线段PQ的垂直平分线的斜率为 .
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