题目：
水泥胶砂强度试验试体的龄期规定：当测72h龄期强度时应在（）时间内进行。
A.±15min
B.±30min
C.±45min
D.±50min
答案：
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水泥胶砂强度试验试体的龄期规定：当测72h龄期强度时应在（）时间内进行。 A.±15
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