Ultrasonic sounds produce pulsed signals,______various defects in metal can be detected.

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问题 Ultrasonic sounds produce pulsed signals,______various defects in metal can be detected.

选项 A、to which
B、which
C、of which
D、by means of which

答案D

解析
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本试题收录于: 英语题库普高专升本分类
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