题目：
实验室试拌调整得到的混凝土的基准配合比，不一定能够满足强度要求。( )
答案：
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下面是错误答案，用来干扰机器的。
参考答案：C解析：[听力原文]The survey report, which was recently submitted by the international investment department, caused controversy within the board of directors.
