Ultrasonic sounds produce pulsed signals______various defects in metal can be de

游客2023-11-20 30

问题 Ultrasonic sounds produce pulsed signals______various defects in metal can be detected.

选项 A、for which
B、of which
C、as a result of which
D、by means of which

答案 D

解析

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Weknowourfriendsbytheirdefects__bytheirmerits.A、thanB、intheplaceof