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.

admin2013-06-19  27
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)”。
转载请注明原文地址:https://kaotiyun.com/show/YeQK777K
0

专业英语四级

相关试题推荐
随机试题
最新回复(0)