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【单选题】
施工场地范围不大时，在场地中央测设一条或几条互相垂直的轴线，作为施工场地的控制和建筑物定位的依据，这种基线称为（ ）A.
导线
B.
水准路线
C.
建筑基线
D.
垂线
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【简答题】A．Green tea reduces the risk of death from many diseases, including heart diseases. B．The majority of people in northeastern Japan often drink green tea. C．Green tea can significantly reduce the risk ...
【单选题】Several diseases are believed to ______ the lives of many children annually, malaria _______. [ ]
A.
claim, included
B.
kill, to be included
C.
be claiming, is included
D.
be killing, included
【简答题】简述聚氯乙烯( PVC )的合成方法。
【单选题】According to the passage, many preventable diseases outbreak is partly because
A.
the money raised is not well-spent.
B.
scientific research has failed.
C.
many children are unvaccinated.
D.
the diseases are severe.
【单选题】合成聚氯乙烯，下列的说法正确的是（ ）
A.
用食盐、水和乙烯为原料可以合成聚氯乙烯
B.
用氯气和乙炔为原料可以直接合成聚氯乙烯
C.
合成聚氯乙烯一定涉及氧化还原反应
D.
合成聚氯乙烯一定涉及加成聚合反应
【简答题】聚氯乙烯根据合成方法不同可分为[填空(1)]、[填空(2)]、本体法聚氯乙烯和溶液法聚氯乙烯，其中[填空(3)]使用量最大。
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