2. 专升本
  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、to which
B、which
C、of which
D、by means of which
答案D
解析
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