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外语
Ultrasonic sounds produce pulsed signals______various defects in metal can be detected.
Ultrasonic sounds produce pulsed signals______various defects in metal can be detected.
admin
2013-06-19
19
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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专业英语四级
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