问题
单项选择题
在泵送混凝土的原材料和配合比中应注意，粗骨料宜优先选用（）。
A．砂石
B．碎石
C．砾石
D．卵石
答案
参考答案：D
解析：
当水灰比相同时卵石混凝土比碎石混凝土流动性好，与管道摩阻力小，所以应优先选用卵石。
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在泵送混凝土的原材料和配合比中应注意，粗骨料宜优先选用（）。
A．砂石
B．碎石
C．砾石
D．卵石
参考答案：D
解析：
当水灰比相同时卵石混凝土比碎石混凝土流动性好，与管道摩阻力小，所以应优先选用卵石。
| 用方框中所给单词的适当形式填空，使短文正确通顺。每词限用一次。 | |
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