砖基础施工前，砖应提前1～2d浇水湿润，烧结普通砖含水率宜为()。
A.5%～10%
B.5%～15%
C.10%～15%
D.15%～20%
参考答案：C
Is she playing the piano? [ ]
A. Yes, she is.
B. No, she isn't.
置信区间越窄，表示计量值越接近于真值。
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