题目内容

How does Little Brad comfort his mother？

A. He says that they can overcome the difficulties.
B. He says that they can find a different way.

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更多问题

What does Little Brad want to say to his Dad？

A. He makes those weird actions willfully.
B. He make those weird actions unintentionally.

混凝土中的水泥砂浆，在混凝土硬化前后起( )作用

A. 胶结
B. 润滑和胶结
C. 填充
D. 润滑和填充

缓凝剂、早强剂和速凝剂属于()。

A. 改善混凝十其他性能的外加剂
B. 改善洮凝土耐久性的外加剂
C. 改善混凝土拌和物流动性能的外加剂
D. 调节混凝土凝结时间和硬化性能的外加剂

加速混凝土早期疆度发展，并对后期强度无显著影响的外加剂是()

A. 减水剂
B. 引气剂
C. 早强剂
D. 膨胀剂