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 定语从句。for which表示目的；of which表示所属；as a result of which相当于表示由其引导的定语从句与其所修饰的主句构成因果关系；by means of意为“通过(某种方式)”。
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