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【单选题】
在原材料一定的情况下,影响混凝土强度决定性的因素是( )。A.
水泥标号
B.
水灰比
C.
骨料种类
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反馈参考答案：
举一反三
【简答题】若双曲线 的实轴长、虚轴长、焦距成等差数列，则双曲线的离心率为__________.
【单选题】The boy who offered me his seat is called Tom.
A.
simple sentence
B.
compoud sentence
C.
complex sentence
D.
compound-complex sentence
【简答题】The boy who offered me his seat is called Tom.
【单选题】His classmates offered him their congratulations ______ his successful performance.
A.
at
B.
on
C.
for
D.
of
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