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【简答题】
如图所示结构用位移法分析时基本示知量的数目为()。 (A)两个角位移，一个线位移 (B)三个角位移，两个线位移 (C)三个角位移，一个线位移 (D)一个角位移，两个线位移
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【单选题】除了对那些不可见焊点如BCA等进行多层图像“切片”检测,还可检测通孔焊点,检查通孔中焊料是否充实的检测是以下哪一种?
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