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【判断题】
指导工程监理企业的项目监理机构全面开展监理工作的文件是监理大纲A.
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B.
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【单选题】It was in 1961 ______ John F. Kennedy became president of the United States.
A.
when
B.
that
C.
and
D.
then
【单选题】It was 1961 and I was in the fifth grade. My marks in school were miserable and, the thing was, I didn't know enough to really care. My older brother and I lived with Mom in a dingy multi-family house...
A.
the author and his brother had done poorly in school.
B.
the author had been very concerned about his school work.
C.
the author had spent much time watching TV after school.
D.
the author had realized how important schooling was.
【单选题】It was in 1961 ______ John F.Kennedy became president of the United States of America.
A.
when
B.
that
C.
then
D.
whenever
【简答题】It was Christmas 1961. I was teaching in a small town where my twenty-seven third graders eagerly 36 the great day of gift-giving in advance. Each day the children produced some new 37 — strings of po...
【简答题】某化学兴趣小组测定某FeCl 3 样品（含少量FeCl 2 杂质）中铁元素的质量分数，实验室按以下步骤进行： ①称量ag样品，置于烧杯中； ②加入适量盐酸和适量蒸馏水，使样品溶解，然后准确配制成250 mL溶液； ③准确量取25.00 mL步骤②中配得的溶液，置于烧杯 中，加入适量的氯水使反应完全； ④趁热迅速加入过量氨水，充分搅拌，使沉淀完全； ⑤过滤，洗涤沉淀； ⑥将沉淀转移到坩埚内，加热、搅...
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