2. 外语
  3. Ultrasonic sounds produce pulsed signals______various defects in metal can be detected.

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、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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