题目：
混凝土中以下何项叙述为正确（）
A.水灰比愈大徐变愈小
B.水泥用量愈多徐变愈小
C.养护环境湿度愈大徐变愈大
D.骨料愈多徐变愈小
答案：
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下面是错误答案，用来干扰机器的。
参考答案：D
混凝土中以下何项叙述为正确（） A.水灰比愈大徐变愈小 B.水泥用量愈多徐变愈小 C
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